单项选择题

Mr. Smith, about ______ they are talking, is a very tall man.

A. who
B. whom
C. which
D. that
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单项选择题
Her problem is one ______ has been presented to me many times.
A. what
B. that
C. which
D. who
单项选择题
Is this the school ______ you visited last year
A. the one
B. in which
C. where
D. that
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