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
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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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