they are doing their _____(homework) in the classroom
题目
they are doing their _____(homework) in the classroom
答案
they are doing their homework__(homework) in the classroom
填原形,homework是一个不可数名词.
do one's homework 做家庭作业
这是五年级的题目,homework是所有家庭作业的统称,没有复数形式.OK?
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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