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1.        The lack of complete historical records from the mid-to-late 1800’s have made some Black inventions difficult to trace to their originators.

(A) have made some Black inventions difficult to trace to their originators

(B) have made for difficulties in tracing some inventions by Blacks to their originators

(C) have made it difficult to trace some inventions by Blacks to their originators

(D) has made it difficult to trace some inventions to their Black originators（D）

(E) has made it difficult in tracing some Black inventions to their originators

E为什么错？ 不是be difficult in doing sth 吗？好像也有it is difficult to do sth. 但是怎么区分，特别是两个答案都有的情况下？ 谢谢

我觉的be difficult in doing sth 表目前(重复动作).  it is difficult to do sth表目的(一次性), D表式做...困难, 感觉是选D,

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固定用法

difficult (for somebody) to understand/find/obtain etc That's rather difficult for me to explain.He's finding it difficult to get a job.

make life/things difficult for somebody (=cause problems for someone) She's doing everything she can to make life difficult for him.

谢谢。但是我始终记得（有可能记错，虽然可能性较小）以前上英语课时，又学到困难后面加（in）doing sth. 难道是difficulty in doing sth? 哎，我手头有一本很大的苇氏词典，可惜上面只有解释，没有这样的短语， 下载朗文，我暂时也还没搞定

难道真的没有difficult(y) in doing sth这种用法？

我在英语辅导报上看到这样的句子

One with a small vocabulary will find it very difficult in reading comprehension。有点迷惑。

另外，我终于通过查找发现：在某些“动词+宾语+介词+动名词”的结构中，其介词往往省略
常见的此类结构有：
spend…(in) doing花……做……
pass…(in) doing花……做……
waste…(in) doing做……浪费
lose no time (in) doing不失时机做
employ oneself (in) doing从事于
have trouble (in) doing做……有麻烦
take… (in) doing带……去做……
have difficult (in) doing做……有困难
busy oneself (in) doing忙于做……
occupy oneself (in) doing从事于
have fun (in) doing做……开心
have a hard time (in) doing做……艰难
prevent…(from) doing阻止
have business (in) doing做……任务
stop…(from) doing阻止……做……。例如：
Don’t waste your time crying for the moon.
别做这种徒劳的事情。
He always passes his time reading.
他向来以读书消遣时光。
He employs himself writing.
他从事写作。
[例题] I had great difficulty _______ the job.
[A] to do      doing     [C] to be doing    [D] done
[答案] B。
所以，我在想，have difficult(y) (in) doing 和 it is difficult to do 都是对的。

但是在这道题中，make it difficult to do, 我还是心中存疑。望有更进一步的指正！

我不确定是否有difficult in doing的结构，但我认为你从报上摘录的那个例子应该是错的，have作动词，至少应该是difficulty(名词)构成have difficulty in doing，这个结构是可行的；

本题之所以用has made it difficult to do关键在于it是一个逻辑主语，其指代对象一般要么是that从句，要么是不定式，所以此处不能用其他结构，此句可变化为：has made to do XX difficult；此外，be difficult to do也是一个十分常用的结构，比之difficulty in doing要简洁；

You are very right!!! Let's see what I found just now:

The dusty air makes it difficult to get a clear picture of space .

充满尘埃的大气给拍摄太空的清晰图象造成了困难。

在这个句子中含有一个带有it作为形式宾语的复合结构，这就是make it difficult to get a clear picture，而真正的宾语则是动词不定式短语to get a clear picture .

英语中有些及物动词，其后要求跟复合宾语时，都可以跟一个带形式宾语it的复合结构；这些动词有find , suppose , think , make , consider等。而在这种复合结构中，往往有一个形容词或名词作宾语补足语。例如：

I. consider it great honour to have been invited to such an important meeting .

我认为被邀参加如此重要的会议是极大的荣幸。

He found it rather difficult to work the problem out without any help .

他觉得没有任何帮助而解决这一难题是相当困难的。

Children should make it a rule to wash hands before meals

我部分同意stoneren的观点, 实际上have difficulty in doing sth 是习惯用语之一.  be difficult in doing sth 如果是对的, has made it difficult in tracing some Black inventions to their originators 的to do ...表目的状语也没有错呀?   除了这一点, 我还觉得有Black inventions 和 their black originators的区别.不同情况. black放在inventions前会不会有歧义呢?餐比较起来,还是觉得放在originators前比较好!