they were driving home while it ____heavily

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
英语人气:436 ℃时间:2019-10-11 19:38:36
优质解答
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.
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