His father _____several times during the war of liberation.
题目
His father _____several times during the war of liberation.
A had been wounded B was wounded C wounded D had wounded
答案
B 有具体时间状语用过去时表示过去发生,并不需要用完成时强调对现在有什么影响
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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