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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
考察情態(tài)動詞，四個選項在第三人稱后分別表示會；應該、能、一定必須和可能。might語氣比can弱。在表示猜測的時候，might用于肯定推測，can用于否定推測。根據(jù)題意選B，他能是誰呢？
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