单项选择题

-- The light in the office is still on. -- Oh, I forgot ______.

A．turning it off
B．turn it off
C．to turn it off
D．having turned it off
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单项选择题
It was on Sunday evening ______ all this happened.
A．when
B．that
C．in which
D．on which
单项选择题
She won't believe it until she ______ it with her own eyes.
A．see
B．has seen
C．saw
D．will see
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