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Continueheatinguntilsteam.A.hasappearedB.appearC.appearedD.willappear
题目详情
Continue heating until steam _.A.has appeared B.appear C.appeared D.will appear
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答案和解析
选A
until后面是时间状语从句,所以对于将来的事情要用现在的某一时态来表达,所以C和D错
B选项中appear应该加S,因为steam是单三主语
所以排除掉就只剩下A咯
until后面是时间状语从句,所以对于将来的事情要用现在的某一时态来表达,所以C和D错
B选项中appear应该加S,因为steam是单三主语
所以排除掉就只剩下A咯
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