问题补充：
------ Who is that man over there? it be our teacher?
------ No, it not be our teacher. It be Mr. Zhang.
A. can ; can; must
B. must; must; can
C. can; must; must
D. can; must; can
答案：
(答案→)A. can ; can; must
B. must; must; can
C. can; must; must
D. can; must; can
解析：考查情态动词。“那边那个人是谁？有可能是我们的老师吗？”“不，不可能是我们的老师。他一定是张老师。”can表示肯定推测，意为“可能”，常用于否定句和疑问句；can’t“不可能”；must表示肯定的推测，意为“一定”。故选A。
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