单项选择题

The student asked her professor if he would have gone on the space ship he did know earlier（）.

A．if he knew
B．if he knows
C．he had known
D．had he known

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单项选择题
The achievements of the greatest minds in science could never have been reached if it had not been for the patient and accurate work of hundreds of other people（）.

A．has it not been
B．if it had been
C．if hasn't been
D．had it not been
单项选择题
According to some scientists, the computer will do much harm to people''s health as smoking and drugs do（）.

A．does much harm ... smoking
B．will do as much harm ... cigarettes
C．will be doing as much harm ... smoking
D．does as much harm ... cigarettes
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