单项选择题

If the policemen had arrived two minutes later than that, the man must have been killed by the gang.

A. Had the policemen arrived
B. If the policemen arrived
C. If the policemen arrived
D. Had the policemen had arrived
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单项选择题
He must have been very hard to please, indeed, if he did not approve the salary of he job.
A. if he had not approved
B. if he is not approved of
C. if he not approves

D. if he had not approved of
单项选择题
For centuries animals have been used as surrogates for people in experiments to assess the effects of therapeutic and other agents that may be later used for humans.
A. which may later be used fr humans
B. that may be later used in humans
C. which might later be used for humans
D. that might later be used in humans
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