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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单项选择题
()had I finished the test () the bell rang.

A．Never ... then
B．No sooner ... then
C．Hardly ... when
D．Seldom ... when
单项选择题
I can't help()his expression when he receives the gift.

A．to imagine
B．imagine
C．imagining
D．to have imagined
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