问题

Listen! There is a knock on the door.Who _____ it be?—It must be Jack.Just now I sent for him. [ ]

A:shall
B:can
C:must
D: might

正确答案是：

同类题型

Can you imagine _______ in the future

Scientists have to work hard to keep _____ with modern discoveries and developments. [ ]

________ will the dinner be ready, Mum—Ten more minutes.

We _____ three hours finishing our homework yesterday.

his unhappy childhood,the boy’s seemed quiteodd and strange.