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

发布时间：2020-08-16 10:21:08


I had not been reading for half an hour      I heard the steps outside.
A. when
B. while
C. as
D. since

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(答案→)A. when
B. while
C. as
D. since
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