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题型:句型转换 题类:常考题 难易度:普通
试题来源:人教版(新课程标准)高中英语必修1 Unit 4同步练习二
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组卷次数:21次 +选题
It won't {#blank#}1{#/blank#} {#blank#}2{#/blank#} before you know what to do to win the game if you sit down and look at the rules.
→Not until{#blank#}1{#/blank#} how serious the pollution was.
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