—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
本題考查情態(tài)動詞。句中can表示推測，“可能”之意。句意：聽！有人敲門，可能是誰呢？——一定是杰克，剛才我去請他的。
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