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发布时间:2023-11-15 18:11:01

[单项选择]This is so difficult a problem that the scientist is known to ______ on it for about ten years, but hasn't found an answer yet.
A. have worked
B. have been working
C. be working
D. work on

更多"This is so difficult a problem that"的相关试题:

[单项选择]The scientist was so absorbed in his work that he was not ______ of the fire that was spreading to his room.
A. adequate
B. alive
C. aware
D. awake
[单项选择]This mathematic problem was so difficult that no student and no teacher_________ able to solve it.
A. were
B. is
C. was
D. are
[单项选择]This difficult problem we face in the project has to be tackled before we can ______ to others.
A. pursue
B. advocate
C. precede
D. proceed
[单项选择]It would be difficult for one so ______ to be led to believe that all men are equal and that we must disregard race, color, and creed.
A. emotional
B. broadminded
C. tolerant
D. intolerant
[单项选择]The most difficult problem we faced with is to reduce China's population to less than 1 billion within 20 years.
A. 现在摆在我们面前最艰巨的问题就是在20年里把中国人口降低到10亿。
B. 我们所面临的最艰难的问题是在20年里使中国的人口减少10亿。
C. 我们所面临的最艰难的问题是在20年里把中国人口降低到10亿以下。
D. 最艰巨的问题摆在我们面前就是在20年里把中国人口减少10亿。
[单项选择]First of all, this difficult problem has to be tackled, thus ______ us to proceed to the others.
A. to enable
B. enabled
C. enabling
D. having enabled
[单项选择]To solve such a difficult problem is really ______ my grasp.
A. beyond
B. out of
C. beneath
D. away from
[单项选择]It's really a difficult problem to ______.
A. look at
B. make out
C. deal with
D. dwell on
[单项选择]It is______a difficult problem______nobodY can solve it.
A. such, that
B. so, that
C. so, as
D. such, as
[单项选择]Why is transition so difficult
A. Because transition requires money and time.
B. Because many manufacturers are unwilling to change their equipment.
C. Because research on new materials is very difficult.
D. Because it takes 10 years.
[单项选择]The problem of drunken driving is difficult to solve because _________.


A. alcohol is easily obtained
B. legislation alone is not sufficient
C. legal prohibiting has already failed
D. drinking is linked to organized crime

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