单项选择题

Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.

A. inclined to
B. subjected to
C. prone to
D. bound to
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单项选择题
Do have a cigarette, ______ you
A. can't
B. don't
C. wouldn't
D. won't
单项选择题
The millions of calculations involved, had they been done by hand, ______ all practical value by the time they were finished.
A. had lost
B. would lose
C. would have lost
D. should have lost
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