单项选择题

I don't really work here; I ______until the new secretary arrives.

A．just help out
B．have just helped out
C．am just helping out
D．will just help out
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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
单项选择题
—I'm sorry to keep you waiting. —Oh, not al all. I ______here only a few minutes.
A．have been
B．had been
C．was
D．will be
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