单项选择题

More than one example ______ necessary to make the students understand this rule clearly．

A．should be
B．is
C．are
D．have been
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单项选择题
The factory, including its machines and buildings, ______ burnt last night.
A. is
B. are
C. were
D. was
单项选择题
The old ______ taken good care of in our country.
A. is
B. has
C. are
D. have
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