单项选择题

Setting fire to the public buildings ______ highly dangerous and forbidden by law.

A. are
B. is
C. has
D. were
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单项选择题
Whom ______ this pair of glasses belong to and whose ______ the glasses on the table
A．does；is
B．do；are
C．does；are
D．do；is
单项选择题
E-mail, as well as telephones, ______ an important part in daily communication.
A. is playing
B. have played
C. are playing
D. play
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