You should wash your hands before_____meals.A:have B:having C:to have说答案,再说为什么选,

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You should wash your hands before_____meals.A:have B:having C:to have说答案,再说为什么选,
You should wash your hands before_____meals.A:have B:having C:to have说答案,再说为什么选,

You should wash your hands before_____meals.A:have B:having C:to have说答案,再说为什么选,
B,before是介词,后面加宾语,动名词做宾语

having 介词后面当然要跟动词ing形式

before having meals,选B。before 后面省略主语,应该用-ing形式,不能加动词原形。

B 因为before是介词要加动词ing

B
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选B
介词后要用动词ing形式,再加上是主动吃饭,所以只有B是正确的

b,记住这种题型,出现现在分词作状语的,比如说when,where,之类的一律选ing形式,这是规律

b,before是介词,后用动词ing