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,
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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

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