-Must I finish my homework now ,mom?

题目

-Must I finish my homework now ,mom?
-No,you_____.
A,must B.mustn't C.have to D.don't have to
It is useless_____over the spilt milk .
A.cry B.in crying C.to crying on D.crying
答的好重重有赏

答案

D.don't have to
must的回答一般是needn't = don't have to 的意思.mustn't是禁止的意思,不合题意.
D.crying
T丶Best丿Foo说的没错,it is useless doing/to do something.固定用法.
模式是 pro+be+adj+ving/to do