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新概念英语第三册开头Pre-unittest1问题P5SpecialdifficultiesA.7.Youshouldwaituntiltheroadis(clear)(clean)beforecleaning.8.Didyou(wash)(washup)yourhands?导读答案是clear,wash,为什么啊

题目详情
新概念英语第三册开头Pre-unit test1问题
P5
Special difficulties
A.
7.You should wait until the road is (clear)(clean)before cleaning.
8.Did you (wash)(wash up)your hands?
导读答案是clear,wash,为什么啊
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答案和解析
7题的意思是马路要等到安全无人畅通无碍才能扫,clear有一个意思是无障碍的.clean并无此意.
所以只能用wash