after the patients went into the office ,---- working
题目
after the patients went into the office ,---- working
选啥啊,最好说明理由
A only a doctor did they see B only a doctor saw they
C only a doctor they saw D only a doctor had they seen
答案
A
病人们走进办公室以后,只看到一个医生正在工作.
only放于主句句首,引起倒装,助动词要提前.
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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