单项选择题

Many a student and teacher ______ making a careful study of ______ own problems.

A．are...their
B．is...their
C．are...is
D．is...his
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单项选择题
They ______ TV for two hours.
A．had watched
B．are watching
C．watched
D．have been watching
单项选择题
No matter how frequently, the works of Beethoven (贝多芬)always attract large audience.
A．performing
B．performed
C．to be performed
D．being performed
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