单项选择题

I often thought of my childhood,（）I lived on a farm.

A. when
B. which
C. where
D. who

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He treats it （）a request for information.

A. for
B. as
C. like
D. by
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While I was waiting for her, I killed time（）looking in the show windows.

A. by
B. with
C. in
D. over
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