单项选择题

Tony has to work really hard to ______ the others.

A. catch up with
B. look forward to
C. go on with
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单项选择题
They found ______ impossible to finish their work on time.
A. this
B. that
C. it
单项选择题
They are thinking about ______ to the center of the town.
A. to move
B. moving
C. movement
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