摘要： I had not been reading for half an hour I heard steps outside. A. while B. when C. if D. unless
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I had not been reading for half an hour I heard steps outside.
A. while B. as C. when D. since
查看习题详情和答案>>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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