they were driving home while it ____heavily
题目
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
答案
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.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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