问题
选择题
— Who is the girl standing over there?
— Well, if you _____ know, her name is Mabel. [ ]
A. may
B. can
C. must
D. shall
答案
答案：C
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— Who is the girl standing over there?
— Well, if you _____ know, her name is Mabel. [ ]
A. may
B. can
C. must
D. shall
答案：C