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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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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