-I called you yesterday evening,but nobody answered the phoone.
题目
-I called you yesterday evening,but nobody answered the phoone.
-Oh,I___a walk with my mother at that time.
A.take B.took C.am taking D.was taking
答案
答案：D
at that time 在那个时候,强调这里用过去进行时.
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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