do you know the difficulty he had________the work(finishing)为什么是finishing
问题描述：
do you know the difficulty he had________the work(finishing)
为什么是finishing
答
had the difficulty (in)doing sth
这里的in可省略，所以是finishing
我支持
答
have difficulty in dong sth 'in'可被省略
答
楼上的说得对
答
have difficulty in doing sth固定搭配，意为：do sth有困难
答
整个句型应该是（陈述句的）：He had difficulty in finishing the word.
所以had是动词，后面接的宾语是difficulty；而不是作为助动词表完成时。
答
difficult in doing sth
答
这里还有个定语从句,在difficulty后省略了关系代词that/which,在从句中指代difficulty,所以是He had the difficulty (in) finishing the work.
答
had the difficulty (in)doing sth
这里的in可省略，所以是finishing