Who __ the telephone It ___ by Amy .A was invented was invented B invent
题目
Who __ the telephone It ___ by Amy .A was invented was invented B invent
Who __ the telephone It ___ by Amy .A was invented was invented B invented was invented
答案
选B,第一个who做主语,用主动,invented是过去式.第二个空,it主语,用被动,用was.invent：发明（动词）
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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