单项选择题

Every means ______ tried, but in vain.

A. have been
B. has been
C. are
D. is
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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
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
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