Julia must ______ now, because the light of her room is turned off.

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问题 Julia must ______ now, because the light of her room is turned off.

选项 A、sleep
B、sleeping
C、be sleeping

答案C

解析由后半部分句意“因为她房间的灯关了”可推测Julia一定“正在睡觉”。用must的现在进行时“must be doing”表示。选项A为一般现在时，不符合题意，选项B缺少be动词，也不正确。故选C。

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