Televisions enable us to see things happen almost at the exact moment______.
题目
Televisions enable us to see things happen almost at the exact moment______.
A which they are happening B they are happening C which they happen D they have happened
我觉得应该是过去进行时，电视不是应该看到过去正在发生的吗？
答案
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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