单项选择题

Playing computer games ______.

A. are a waste of time
B. is waste time
C. is a waste of time
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单项选择题
It is possible ______ there on time.
A. go
B. to go
C. going
单项选择题
Someone is knocking at the door. Go to see ______.
A. who he is
B. who is it
C. who it is
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