华中科技大学苏州:He achieved his aim __B__ A.by hard working B.by hard work 为什么选B

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by后面不是+doing吗

by为介词后面要加上名词或者是V-ing .
但是如果选A的话,应该是by working hard.这里的hard是副词.by hard work.这里的hard 是形容词.
是位置错了!!!.A选项的working是动名词,副词应放在其后面!

hard work 是词组
意思是努力学习（工作）
hard 是形容词
work 是动词
当然是work+ing

介词后面可以加doing动名词也可以加名词
这里可以是by hard work也可以是by working hard
其实学英语还是要多读积累语感，靠背各种语法用法是没用的，语言的东西不可能有很严格的用法规律

by 为介词可接名词或doing ,hard work 是名词，所以是正确的
work hard 是动词A应改为 working hard就符合要求了．

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