问题
选择题
—Hey, boy! We should keep the park clean. You _________ throw litter about.
—Sorry, I won't do that again. [ ]
A. mustn't
B. needn't
C. couldn't
答案
答案：A
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—Hey, boy! We should keep the park clean. You _________ throw litter about.
—Sorry, I won't do that again. [ ]
A. mustn't
B. needn't
C. couldn't
答案：A