The scientists form ( ) United States live on ( )eighth floor of the building .
题目
The scientists form ( ) United States live on ( )eighth floor of the building .
A.the an B.an the C.the the D.an an
I found ( )not very difficult to solve the problem.
A.that B.it C.myself D.this
题没抄错啊
答案
C USA前面必须要定冠词the,序数词前面也要the
B it 形式宾语
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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