She was in the middle of telling me the news___a cloud came over her face.
题目
She was in the middle of telling me the news___a cloud came over her face.
A.where
B.why
C.when
D.while
答案
C
她告诉我这个消息的时候,脸上现出忧愁的阴影.
when =at that time 就在那时【就像过去进行时常用的when】
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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