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问题: 一道简单的英语题

In the chemistry lab,everybody should follow( )
A.much do and don't B.many does and don'ts
C.many dos and don'ts D.many do and don'ts
(此题的答案为C,本人不知道为什么选!知道者,请说明一下,谢谢!!!)

解答:

many “dos and don'ts”看作可数名词,该做和不该做的“注意事项,说明,须知”