题目内容
Millie was watching TV ________ Andy came into the room.
| A．while | B．when | C．as | D．if |
B
解析试题分析：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。
考点：考查的用法。
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