—How old are you, madam?— If you _____ know, I'm twice my son's age. [ ]A. can B. mustC. mayD. should -高中英语-n多题

◎ 题干

— How old are you, madam?
— If you _____ know, I'm twice my son's age.

[ ]

A. can
B. must
C. may
D. should

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◎ 解析

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◎ 知识点

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