I saw three girls ___ when I went into the classroom.理由a.dances b.to dance c.danced d.dancing
题目
I saw three girls ___ when I went into the classroom.理由a.dances b.to dance c.danced d.dancing
答案
I saw three girls _dancing__ when I went into the classroom.
进教室时看到的应该是正在发生的动作,所以用see sb doing sth.
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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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