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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As we know, computers are used to store and information efficiently.
A. reclaim
B. reconcile
C. reassure
D. retrieve
单项选择题
Another big issue______the country is the problem of the education of its citizens.
A. confining
B. confirming
C. conforming
D. confronting
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