—I’msorrytokeepyouwaiting.—Oh,

—I’m sorry to keep you waiting.
—Oh, not at all, I______ here only a few minutes.

A．have been

B．had been

C．was

D．will be

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A．one

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A．should keep

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C．should have kept

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A．If only

B．Only if

C．But for

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A．It

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