I _ someone singing in the next door when I _ music .
题目
I _ someone singing in the next door when I _ music .
A listen; hear B listen to hear C hear listen D hear ;listen to
答案
D hear ;listen to
hear sb.doing
listen to sth.
固定搭配
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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