Seeing their teacher ( )(walk)into the classroom,they
题目
Seeing their teacher ( )(walk)into the classroom,they
stopped talking at once.
walk不是一个瞬间动词吗,为什么答案上写的是walking?
答案
see sb.doing sth.看见某人正在做某事,固定表达,所以填写“walking”
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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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