单项选择题

The final examination will cover all ______ taught this term.

A. what has been
B. that has been
C. that was
D. which has been
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Nancy knows a physicist ______ owns a well-equipped laboratory.
A. whom
B. who
C. by whom
D. to whom
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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