单项选择题

The face of the Moon is changed by collisions with meteoroids, ______ new craters to appear.

A. cause
B. causing
C. caused
D. have caused
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单项选择题
There is a real possibility that these animals could be frightened, ______ a sudden loud noise.
A. being there
B. should there be
C. there was
D. there have been
单项选择题
Anyone who has spent time with children is aware of the difference in the way boys and girls respond to ______ situations.
A. similar
B. alike
C. same
D. likely
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