单项选择题

Agriculture was a step in human progress ______ which subsequently there was not anything comparable until our own machine age.

A. to

B. in

C. for

D. from
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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
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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