单项选择题

I don’t quite follow what she is saying.

A．observe
B．understand
C．explain
D．describe
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单项选择题
It took us a long time to mend the house.
A．build
B．destroy
C．design
D．repair
单项选择题
The earth moves around the sun.
A．before
B．round
C．after
D．over
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