Milk bottles need cleaning thoroughly before they are used again ,they?A. don’tB. mustn’tC

发布时间:2020-08-16 10:11:48

Milk bottles need cleaning thoroughly before they are used again ,    they?
A. don’t
B. mustn’t
C. needn’t
D. aren’t

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(答案→)A. don’t
B. mustn’t
C. needn’t
D. aren’t
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