单项选择题

Jack and not I ______ the Great Wall twice.

A. have visited


B. has visited
C. have gone to


D. has gone to
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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
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
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