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
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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
单项选择题
Were it not for the measures timely taken last year by the central government, these banks could have been closed.
A. would have been

B. should have been
C. had to be

D. will have been
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