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
The writer was much kinder to her youngest son than she was to the others, ______, of course, made the others jealous.
A．who
B．that
C．what
D．which
单项选择题
Would you take an offer of, ______, $500 for your car
A．says
B．say
C．to say
D．saying
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