they were driving home while it ____heavilyA snowed B had snowed C had been snowed D was snowing能解释下原因么

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they were driving home while it ____heavily
A snowed B had snowed C had been snowed D was snowing
能解释下原因么

D was snowing
while 后 面常跟过去进行
当下雪下的很大的时候,他们开车回家.

你可以查一下高考必备关于when和while的区别,很全面的