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
They are all very tired, but ______of them would stop to take a rest
A．any
B．some
C．none
D．neither
单项选择题
The purpose of new technologies is to make life easier, ______it more difficult.
A．not make
B．not to make
C．not making
D．do not make
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