Glass milk bottles can be used again and again, but they need thoroughly, they?
A. to clean, needn’t
B. cleaning,don’t
C. clean, aren’t
D. cleaned, can’t
网友回答
A. to clean, needn’t
(答案→)B. cleaning,don’t
C. clean, aren’t
D. cleaned, can’t
解析：need doing sth中 need是实义动词，构成反意疑问句要用do或don’t。