People usually make a wish before ( ) out the candle on their birthday.括号中应填blow的什么形式?

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People usually make a wish before ( ) out the candle on their birthday.括号中应填blow的什么形式?
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People usually make a wish before ( ) out the candle on their birthday.括号中应填blow的什么形式?
People usually make a wish before ( ) out the candle on their birthday.括号中应填blow的什么形式?

People usually make a wish before ( ) out the candle on their birthday.括号中应填blow的什么形式?
此处 before 作为介词处理.
介词后面 用动词的 ing 形式
所以填 blowing
但是 before 和after后面 跟了人,则是 作为连词处理

blowing
分析 before 在……之前,介词后接动词的ING形式
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为你解答。
People usually make a wish before ( blowing,吹) out the candle on their birthday.
通常人们在过生日吹灭蜡烛之前要许个愿的。
解释:before在这里是当介词用,所以后面的动词blow要变为动名词doing来当宾语。