Miss Li requested that her students on time to every class.A.has to be B.were C.must be D.be为什么 不可以选择C

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Miss Li requested that her students on time to every class.A.has to be B.were C.must be D.be为什么 不可以选择C
Miss Li requested that her students on time to every class.A.has to be B.were C.must be D.be
为什么 不可以选择C

Miss Li requested that her students on time to every class.A.has to be B.were C.must be D.be为什么 不可以选择C
这是虚拟语气.当句子的谓语动词是表示命令或请求的词(如ask,demand,suggest等),后面直接接that从句的时候,从句里的谓语动词用do或should do的形式.

因为他只是要求你准时上课,不是一定要每一次都准时上课