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Students  should ______ to choose their own uniforms.
A.allowB.allowedC.are allowedD.be allowed
D

试题分析:句意:应该允许学生们自己选择他们的制服。本句中should是情态动词,后面动词用原形,学生们是允许的对象,故用被动语态。选D。
点评:此类题型主要是确定句子主语与谓语动词的关系。如果是主动关系则用主动语态,反之如果是动宾关系,则用被动语态。
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