They must have been here the day before yesterday,__________

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/09 17:45:03

They must have been here the day before yesterday,__________?
A.mustn't they B.didn't they
C.mustn't have they D.had they
为什么有yesterday 就要用didn't they?
A.为什么不可以呢?

这里的must表示推测不是一般情态动词的用法,所以要看主句的时态,因为是一般过去时（yesterday）,所以要用助动词didn't

They must have been here the day before yesterday,---------- 几道英语竞赛题,1、They must have been here the day before yeasterday Joy _____ here the day before yesterday. He must have lost the key the day before yesterday,_____? He must have been here yesterday,( 改为反义疑问句 (They must have been there yesterday ,______they?)能用"weren't I was here the day before yesterday.(改否定句) I was here the day before yesterday 改为否定句 The day before yesterday. the day before yesterday They will drive home the day before yesterday. They __(not be)at school the day before yesterday.