英语被动式
题目
英语被动式
whit more than 200 million views workdwide ,the latest video gangnan styly __ very popular since ——it.
A.has become：was uploaded B.became ;uploaded C.became:was uploaded D.has become;is uploaded .
此选·A,我不明白为什么后面一个空,要是was uploaded,不能够是uploaded ,过去分词不是一样可以表被动的吗?请高手为我解疑惑
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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