作业帮问一道单选 不解ing~
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/17 02:27:41
问一道单选 不解ing~
The construction of the bridge ______ by the end of next month.
A. must have been completed B. has been completed C. must be completed D. must complete
答案选A 能给解释下么~
The construction of the bridge ______ by the end of next month.
A. must have been completed B. has been completed C. must be completed D. must complete
答案选A 能给解释下么~
must表示推测,本句是对将来的推测,have完成时态的标志,been completed被动式的完成时态,其实就是be+completed的完成时态,就是说事件到那个时候已经完成了.整句的意思是：到下个月底,这座桥的建设一定已经完成了.