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

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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