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
Most children in Great Britain are educated at the public ______.
A. cost
B. payment
C. expense
D. charge
单项选择题
The vision of that big black car hitting the sidewalk a few feet from us will never be ______ from my memory.
A. ejected
B. escaped
C. erased
D. omitted
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