题目内容

—Listen! There is a knock on the door．Who _____ it be?
—It must be Jack．Just now I sent for him．
A．shallB．canC．mustD．might
B
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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