What happens when water ______?A.to boil B.boiling C.will bo
5个回答
选D吧。
当水沸腾的时候发生什么?
从语法方面来说,这个句子是个状语从句,那么从句中必须要有谓语动词,所以只能选C或D,但主句中所用的为一般现在是,从句中就不可能是将来时态,因而选D。
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