lack of communication between parents and children is a main reason.中的lack应该加ing对还是不加呀,
题目
lack of communication between parents and children is a main reason.中的lack应该加ing对还是不加呀,
答案
lack不必加ing,因为lack本身也可以做名词.
例如：
The plant died for lack of water.
植物由于缺水而死了.
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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