Our school _____ the teachers about their teaching last week.A.made a survey of B.do a survey of
题目
Our school _____ the teachers about their teaching last week.A.made a survey of B.do a survey of
C.made a survey for D.do a survey for
答案
答案是 A made a survey of
首先是last week 上周 ,用过去时.survey 调查的意思,后面跟of 表示是关于什么的调查.
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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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