问题
选择题
— 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
答案
答案：B
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— 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
答案：B