摘要：35．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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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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I had not been reading for half an hour _____ I heard the steps outside.
| A．when | B．while | C．as | D．since |