单项选择题

Although he knew little about the large amount of work done in the field, he succeeded ______ other more well-informed experimenters failed.

A. which
B. that

C. what

D. when
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单项选择题
Greater efforts to increase agricultural production must be made if food shortage ______avoided.
A. be

B. will be
C. to be

D. is to be
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 complete
C. to have completed

D. to have been completed
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