单项选择题

During the voyage, Darwin collected a good deal of information about living things, which ______ led to his famous book "On the Origin of Species".

A. lastly
B. completely
C. essentially
D. eventually
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单项选择题
______ I’d have told you.
A. If I would have known it B. If I had have known it
C. Had I known it D. Should I known it
单项选择题
While I was waiting for her, I killed time ______ looking in the show windows.
A. by
B. with
C. in
D. with
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