单项选择题

It ______ me half an hour to finish my paper.

A. took
B. cost
C. spent
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单项选择题
Playing computer games ______.
A. are a waste of time
B. is waste time
C. is a waste of time
单项选择题
It is possible ______ there on time.
A. go
B. to go
C. going
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