mary with her parents often ( )a walk in the park
题目
mary with her parents often ( )a walk in the park
mary with her parents often ( )a walk in the park after supper.a,has
b,have c,is having d,having
答案
A
因为主语是Mary,单三形式
B 是复数
C 进行时不可和often 连用
D 单独一个非谓语动词不可以做谓语
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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