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I had not been reading for half an hour I heard the steps outside. A．when B．whil

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I had not been reading for half an hour I heard the steps outside. A．when B．whil

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

【答案】

A

【解析】略

 

标签：halfforhourannot

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