单项选择题

If I were on the spot that day, I should be able to prevent the disaster to happen.

A. I should be able to prevent the disaster from happening.
B. I should have prevented the disaster to happen.
C. I would have been able to prevent the disaster from happening.
D. I would be able to prevent the disaster to be happened.

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单项选择题

A great number of graduate students were driven into the intellectual slum where in the United States the intellectual poor became the classic poor.

A. in which
B. at which
C. when
D. while

单项选择题

A number of writers who once greatly disparaged the literary critic have recently recanted, substituting approbation for their former criticism.

A. censure
B. approval
C. adulation
D. analysis