There ( ) a nice desk and some toys in it.A.is B.are
题目
There ( ) a nice desk and some toys in it.A.is B.are
答案
There ( A.is ) a nice desk and some toys in it.
以最接近系动词的名词的单复数为准确定系动词的单复数.
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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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