______ in the classroom now is not allowed.A、To sleepB、SleptC、SleepingD、Bein

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问题 ______ in the classroom now is not allowed.

选项 A、To sleep
B、Slept
C、Sleeping
D、Being slept

答案 A

解析本题考点是不定式。不定式作主语表示在某个场合做具体的事情，而动名词作主语一般表示总的来说做什么事。本句大意：现在教室里不许睡觉。

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