-When can I see my grandson,John?-Don't worry,Granny.He_______be home at any moment.A.shoul...

问题描述:

-When can I see my grandson,John?-Don't worry,Granny.He_______be home at any moment.A.shoul...
-When can I see my grandson,John?
-Don't worry,Granny.He_______be home at any moment.
A.should B.would C.could D.might
为什么不能用could呢

should ,由at any moment,得知,在任何时候,她都应该在家的,
must - can - may -should - would - could -might,推测语气 由肯定到不确定,一次减弱