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. in
B. for
C. to
D. from

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单项选择题
I would appreciate （） it a secret.

A. you to keep
B. your keeping
C. that you keep
D. that you will keep
单项选择题
He was one of the greatest writers （） had ever lived.

A. who
B. which
C. that
D. as
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