I helped him _____ his homework.A.doing B.do C.did D.does
题目
I helped him _____ his homework.A.doing B.do C.did D.does
答案
选B
help sb do表示帮助某人做某事（的全过程）
help sb doing（是一种瞬间动作）
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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