单项选择题

These are common materials ______ we are all familiar.

A. about which
B. of which
C. with which
D. to which
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单项选择题
Do you know the girl ______
A. whom I spoke
B. that I spoke
C. I spoke to
D. to who I spoke
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My wife and I went to Italy last year, ______ we spent a very useful three weeks.
A. which
B. where
C. when
D. why
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