[单项选择]He must have had an accident, or he ______ then.
A. would have been here
B. had to be here
C. should be here
D. would be here

[单项选择]He must have had an accident, or he （） then.
A. would have been here
B. had to be here
C. should be here
D. would be here

[单项选择]He must have had an accident, or he ______ here then.
A. should be
B. would be
C. could have been
D. would have been

[填空题]He said that the driver must have had an accident; otherwise he __________________ (当时应该已经到了).

[填空题]He must have had an accident, or he______(早就应该在这儿了) then.

[简答题]

Everyone must have had at least one personal experience with a computer error by this time. Bank balances are suddenly reported to have jumped from 379 into the millions, appeals for charitable contributions are mailed over and over to people with crazy-sounding names at your address, department stores send the wrong bills, utility companies write that they’re turning everything off, that sort of thing. 46) If you manage to get in touch with someone and complain, you then get instantaneously typed, guilty letters from the same computer, saying, "Our computer was in error, and an adjustment is being made in your account."
These are supposed to be the sheerest, blindest accidents. Mistakes are not believed to be part of the normal behavior of a good machine. If things go wrong, it must be a personal, human error, the result of fingering, tampering, a button getting stuck, someone hitting the wrong key. The computer, at its normal best, is infallible.<

[单项选择]To Err Is Human
Everyone must have had at least one personal experience with a computer error by this time. Bank balances are suddenly reported to have jumped from $ 379 into the millions, appeals for charitable contributions are mailed over and over to people with crazy sounding names at your address, department stores send the wrong bills, utility companies write that they’re turning everything off, that sort of thing. If you manage to get in touch with someone and complain, you then get instantaneously typed, guilty letters from the same computer, saying, "Our computer was in error, and an adjustment is being made in your account."
These are supposed to be the sheerest, blindest accidents. Mistakes are not believed to be the normal behavior of a good machine. If things go wrong, it must be a personal, human error, the result of fingering, tampering a button getting stuck, someone hitting the wrong key. The computer, at its normal best, is infallible.
I wo
A. making mistakes is confined only to human beings
B. every human being cannot avoid making mistakes
C. all human beings are always making mistakes
D. every human being is born to make bad mistakes