单项选择题

"Are you going to sit here and ______" a vegetarian from the United States required.

A. watch it happen

B. watch it to happen
C. watching it happen

D. watching it to happen
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if we can ______ our present difficulties, then everything should be all right.
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______ is well-known to us all, China is a large country with a long history.
A. It
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