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【题目】Smart phones ______ in the classroom.
A.aren't allowed
B.aren't allowing
C.allow
D.is allowed

【答案】A
【解析】句意:在教室里不允许智能机。A. aren't allowed被动语态形式;B. aren't allowing现在进行时态形式;C. allow一般现在时态形式;D. is allowed被动语态形式。句子主语smart phones是谓语动词allow的承受者,句子用被动语态,主语phones是复数形式,be用are。故选A。

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