[单项选择]They ______ us since five o'clock this morning until now.
A. are helping
B. help
C. have helped
D. have been helping

[单项选择]They ______ us since five o'clock this morning until now.
A. are helping
B. help
C. have helped
D. have been helping

[单项选择]

Passage Five To us it seems so natural to put up an umbrella to keep the water off when it rains. But actually the umbrella was not invented as protection against rain. Its first use was as a shade against the sun! Nobody knows who first invented it, but the umbrella was used in very ancient times. Probably the first to use it were the Chinese, as early as the eleventh century B. C. We know that the umbrella was used in ancient Egypt and Babylon as a sunshade. And there was a strange thing connected with its use: it became a symbol of honour and authority. In the Far East in ancient times the umbrella was allowed to be used only by royalty or by those in high office. In Europe, the Greeks were the first to use the umbrella as a sunshade. And the umbrella was in common use in ancient Greece. But it is believed that the first persons in Europe to use the umbrella as protection against the rain were the ancient Romans. During the Middle Ages, the use of the umbrella practical
A. No one exactly knows who was the inventor of the umbrella.
B. The umbrella was first invented to be used as protection against the sun.
C. The umbrella changed much in style in the eighteenth century.
D. In Europe the Greeks were the first to use the umbrella.

[单项选择]Since the airport is closed this morning, it must ______ last night.
A. snow
B. have snowed
C. have been snowed
D. have being snowed

[单项选择]It _______ since this morning.
A. was raining
B. is raining
C. raining
D. has been raining

[单项选择]The seminar will adjourn ______ five o'clock.
A. (A) in
B. (B) on
C. (C) at
D. (D) the

[单项选择]I ______ since seven this morning.
A. had typed
B. typed
C. am typing
D. have been typing

[单项选择]It took us five hours to get down from the mountain. After having a rest we to the nearest village.
A. proceeded
B. advanced
C. progressed
D. plunged

[单项选择]Since the road is wet this morning, ______last night.
A. it must rain
B. it must be mining
C. it must have rained
D. it must have been rain

[单项选择]Since the road is wet this morning, ______ last night.
A. it must rain
B. it has rained
C. it must have rained
D. it must have been rained

[单项选择]She told us that five years before, she had been just one of the high school students, but it seemed that overnight she turned into a singer.（）
A. 她告诉我们，五年前她不过是一个普通的高中生，然而似乎是在一夜之间她便成了歌星。
B. 五年前她跟我们说，她曾是那些高中生中的一员，但她在黑夜中摸爬滚打才如愿当上了歌星。
C. 她坦白说她是在五年前从一名高中生变成歌星。
D. 她对我们说，她只读了五年书，后来好像时来运转，她突然成了歌星。

[名词解释]Clock Cycle

[单项选择]The first major new development in linguistics until the 13th century was______ grammar.
A. structural
B. speculative
C. generative
D. traditional

[单项选择]Young people are not allowed to drink in a bar until______.

[单项选择]The room needs _____, but it will have to wait until Tuesday.
A. cleaning
B. cleaned
C. to clean
D. being cleaned