单项选择题

______ many times, but he still couldn't understand it.

A．Having been told
B．He was told
C．Though he had been told
D．Having told
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单项选择题
You know that's right, ______.
A．is it
B．isn't it
C．do you
D．don't you
单项选择题
When we woke up, everywhere was ______ snow.
A．covered
B．covered in
C．covered with
D．covering
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