问题
选择题
— How old are you, madam?
— If you _____ know, I'm twice my son's age. [ ]
A. can
B. must
C. may
D. should
答案
答案：B
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— How old are you, madam?
— If you _____ know, I'm twice my son's age. [ ]
A. can
B. must
C. may
D. should
答案：B