all morning as she waited for the medical report from the doctor ,her nervousness
题目
all morning as she waited for the medical report from the doctor ,her nervousness
A.has grown B.is growing C.grew D.had grown
答案
C.grew ( nervous,Not nervousness)
与waited 同时发生、同步进行,都是过去.
D.指 先于 waited 发生,不合题意.
A,B 明显时间不一致.
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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