one English grammer question
题目
one English grammer question
Within the last year,astronomers have come closer than ever___.
A.to deciding which of the questions is right
B.to decide which of the question is right
C.deciding whether the question is right or not
D.and decided which of the questions is right
答案
A
come close to是固定短语,所以是介词,不是不定式.
介词后用现在分词.
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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