问题补充:
—Listen! There is a knock on the door. Who it be?
—It must be Jack. Just now I sent for him.
A. shall
B. can
C. must
D. might
答案:
A. shall
(答案→)B. can
C. must
D. might
解析:考察情态动词,四个选项在第三人称后分别表示会;应该、能、一定必须和可能。might语气比can弱。在表示猜测的时候,might用于肯定推测,can用于否定推测。根据题意选B,他能是谁呢?
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