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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.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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