Parents must take good care of their children they?A. mustn’tB. don’tC. needn’tD. aren’t

问题补充：

Parents must take good care of their children, they?

A. mustn’t

B. don’t

C. needn’t

D. aren’t

答案：

A. mustn’t

B. don’t

(答案→)C. needn’t

D. aren’t

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