She came into the room while they ______ television.

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问题 She came into the room while they ______ television.

选项 A、have watched
B、have been watching
C、were watching

答案C

解析此题考查动词时态。主句是过去时，从句也必须为过去时，A、B两项分别为现在完成时和现在完成进行时，不符题意。

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