英语过去进行时
题目
英语过去进行时
They all looked at the man surprisedly.No one knew what ______.A.is happening B.has happened C.was happening D.have happened答案是C如何理解
答案
They all looked at the man surprisedly.No one knew what ______.A.is happening B.has happenedC.was happening D.have happened【答案】C【解析】通过前句的 looked 和 knew 可以判断出是过去时态,根据时态...
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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