单项选择题

You ought to do ______ he tells you.

A．where
B．because
C．as
D．which
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单项选择题
He used ______ that there was nothing he couldn't do.
A．believe
B．to believe
C．to have believed
D．believed
单项选择题
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
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