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Millie was watching TV ________ Andy came into the room.
A.whileB.when C.asD.if
B

试题分析:句意:当安迪进入房间的时候,米莉正在看电视。A. while  当……时候;从句中的动词用持续性动词; B. when当……时候;从句中的动词可以用持续性动词或非持续性动词; C. as 当……时候。强调主句和从句的动作同时进行; D. if如果。根据句意故选B。
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