单项选择题

I’ll never forget the days ______ I worked together with you.

A. when
B. where
C. which
D. that
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单项选择题
We don’t know the reason ______ he didn’t show up.

A. that
B. which
C. /
D. why
单项选择题
She is one of the volunteers who ______ greatly praised by the government.
A. have
B. have been
C. has
D. has been
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