单项选择题

—I'm sorry for keeping you waiting.
—Never mind. I ______ here only a few minutes.

A．came
B．have come
C．was
D．have been
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______ is generally accepted, economical growth is determined by the smooth development of production.
A．What
B．That
C．it
D．As
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I'm sure the letter won't arrive in time ______ it is sent by air.
A．if
B．until
C．because
D．unless
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