—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(dòng)詞，四個(gè)選項(xiàng)在第三人稱后分別表示會(huì)；應(yīng)該、能、一定必須和可能。might語(yǔ)氣比can弱。在表示猜測(cè)的時(shí)候，might用于肯定推測(cè)，can用于否定推測(cè)。根據(jù)題意選B，他能是誰(shuí)呢？
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