单项选择题

The second book was （） by August 1952, but two years later, the end was still nowhere in sight.

A. completed
B. to have completed
C. to complete
D. to have been completed

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单项选择题
When I caught him （）, I stopped buying things there and started dealing with another shop.

A. cheating
B. cheat
C. to cheat
D. to be cheating
单项选择题
Because of the unexpected changes, they postponed （） us an answer.

A. giving
B. have given
C. to give
D. to have given
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