Her mother came back while she ( )her homework A did B doing C was doing D does
题目
Her mother came back while she ( )her homework A did B doing C was doing D does
答案
选C吧.While是 当……的时候,后面应该接进行时,本句话的意思是她妈妈回来的时候她正在做家庭作业.
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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