英语语法选择题（请说明原因）
题目
英语语法选择题（请说明原因）
It is now clear that no such creatures as vampires have seen and none _____in the world.
A.was found B.are found C.have been found D.have been found out
改正：题目少了一个been,应该是It is now clear that no such creatures as vampires have been seen and none _____in the world.
答案
选A,很明显find的形式由其主语none决定,用第三人称单数.若用现在完成时需把have改为has.
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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