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

I got a letter this afternoon. It was ____my foreign friend.

Are you going out It’s windy and cold outside.—I know, but it’s the last day to buy tickets to the basketball final, ______ I must go.

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The plan _______ to be a perfect one. [ ]

He has _______ smoking because of his lung cancer. [ ]