young students should not be allowed to work at night,because they( )to sleep Amust Bshould Cneed

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young students should not be allowed to work at night,because they( )to sleep Amust Bshould Cneed

只能是C ( 只有need 有 need to do 的用法)
其它两个没有 must to do,should to do的用法

选C，need to do sth.小学生需要睡觉。

C

must和should不能跟to的，排除

考易混词的辨析，mus做情态动词语气最为强烈，should为情态动词，常译为“应该”，情态动词后跟动词原形；而need为“需要”，即可做实意动词也可以做情态动词，做实意动词有这样两个常用结构：人做主语用need to do，物作主语用need doing/to be done；做情态动词多用于否定句和一般疑问句。
选择c。通过they ( )to sleep，…不应该被允许晚上学习，他...

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考易混词的辨析，mus做情态动词语气最为强烈，should为情态动词，常译为“应该”，情态动词后跟动词原形；而need为“需要”，即可做实意动词也可以做情态动词，做实意动词有这样两个常用结构：人做主语用need to do，物作主语用need doing/to be done；做情态动词多用于否定句和一般疑问句。
选择c。通过they ( )to sleep，…不应该被允许晚上学习，他们需要睡觉，从而得知题干给的是不定式，所以只有C。

希望你满意。。

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