单项选择题

Nancy knows a physicist ______ owns a well-equipped laboratory.

A. whom
B. who
C. by whom
D. to whom
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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
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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