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