--Must I renew the book now?-No,you _____.You _________ that before
问题描述：
--Must I renew the book now?-No,you _____.You _________ that before
2.--Must I renew the book now?
-No,you _____.You _________ that before the deadline.
A.mustn't; should do B.needn’t; should have done
C.may not; should do D.can't; should have done
想说答案是B的请绕行..
答
因为这位同学借的书已经过期了 不能再更新延期
no,you can't 不能延期了
you should have done that before the deadline 你本应该在到期之前延期的.
should have done 表示应该做却以前没有做好像懂了但是提问时为什么用must不用can？以下是我个人的理这位学生以为自己还有机会延期，于是问：我必须得现在就延期吗？？结果人家说：不好使了，已经过期了。之前该延期的时候你不延期。