单项选择题

The pupils said that a number of questions ______ too difficult.

A．are
B．is
C．were
D．was
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单项选择题
Albert Einstein is a man ______ material things mean nothing.
A. for whom
B. to whom
C. with whom
D. in whom
单项选择题
I was about to leave my house ______ he came.
A. while
B. as
C. when
D. since
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