问题
选择题
—Who is that man?
—That _______ be Mr. Green. He always walks this way. Hi! Mr. Green. [ ]
A. can
B. may
C. need
D. must
答案
答案：D
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—Who is that man?
—That _______ be Mr. Green. He always walks this way. Hi! Mr. Green. [ ]
A. can
B. may
C. need
D. must
答案：D