—Listen! There is a knock on the doorWho it be?—It must be Jack．Just now I sent for him．

发布时间：2020-08-16 19:16:22

—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

网友回答

A. shall
(答案→)B. can
C. must
D. might
解析：本题考查情态动词。句中can表示推测，“可能”之意。句意：听！有人敲门，可能是谁呢？——一定是杰克，刚才我去请他的。
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