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I had not been reading for half an hour I heard the steps outside.A.whenB.whileC

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I had not been reading for half an hour I heard the steps outside.A.whenB.whileC

I had not been reading for half an hour _____ I heard the steps outside.

A.when

B.while

C.as

D.since

试题答案

A

标签：halfforhourannot

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