问题标题:
【英语语法OurChemistryteacherdemanded____intheexperiment.A.wemorecarefulB.ustobemorecarefulC.webemorecarefulD.wemustbemorecareful】
问题描述:

英语语法

OurChemistryteacherdemanded____intheexperiment.

A.wemorecarefulB.ustobemorecarefulC.webemorecareful

D.wemustbemorecareful

高先明回答:
  C.   demand"要求“后面的宾语从句中要用虚拟语气,动词形式是【(should)+动词原形】,should可以省略.故选C
刘佳娜回答:
  weshouldbemorecareful请问bemorecareful这三个英语就是动词原型吗?
高先明回答:
  be是动词原形(连系动词)morecareful是形容词careful的比较级,作表语
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