一道关于情态动词的英语题
题目
一道关于情态动词的英语题
He was a good swimmer so he _________ swim to the river bank when the boat sank.
A. could B. might C. should D. was able to
选D为什么不选A
强调能力不应该选择A吗？
答案
be able to 强调结果,成功做成某事
could 强调能力,可能
The cildren were able to run out of the house before it was burnt down.
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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