单项选择题

You ought to do () he tells you.

A.where
B.because
C.as
D.which

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I don't remember()the lights before I left. But the lights are out.

A.turn off
B.turned off
C.to turn off
D.turning off
单项选择题
I'd like to()some sample products before I decide to buy them.

A.send away for
B.send out
C.send off
D.send to
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