问题
选择题
Be polite. You ________ talk to the old like that.
[ ]
A. couldn't
B. needn't
C. mustn't
D. wouldn't
答案
答案：C
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Be polite. You ________ talk to the old like that.
[ ]
A. couldn't
B. needn't
C. mustn't
D. wouldn't
答案：C