单项选择题

Half of those books ______ best-sellers.

A．is
B．are
C．am
D．was
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单项选择题
My brother's room is ______ mine.

A．twice the size of
B．as twice the size
C．as twice as
D．twice the size as
单项选择题
It was Jane ______ bought a dictionary from a second-hand book store yesterday.
A．who
B．which
C．that
D．whom
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