Ourparentsandteachersoftentellusthatwe　　　becarefulenou...

问题详情：

 Our parents and teachers often tell us that we 　　　be careful enough no matter what we do. 

A. mustn’t　　　B. shouldn’t　　C. can’t　　　　D. needn’t

【回答】

C

知识点：虚拟语气与情态动词

题型：选择题