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.when
B.while
C.as
D.since
试题答案
A

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