Unlike in other transportation industries, there are no minimum standards set by government or industry for qualifying for being an engineer on a train.

(A) Unlike in other transportation industries, there are no minimum standards set by government or industry for qualifying for being

(B) Unlike other transportation industries that have minimum standards set by government or industry, there are none for qualifying to be

(C) Although the government or industry usually sets minimum standards for transportation industries, no such one has been set for qualifying as to being

(D) Although the government or industry usually sets minimum standards for transportation industries, no such standard has been set for qualifying to be（D）

(E) Although there are usually minimum standards set by government or industry for transportation industries, there is none for qualifying and being

好像没有人问过。答案选D没有问题。我的问题是D选项中的qalifying to be an engineer on a train, qualify to be 是什么意思呢？好像qualify 只for & as? 请不吝指教！先谢谢了。

金山词霸：

使合格；使具有资格
Do you qualify for the vote?
你有投票资格吗？
I hope to qualify as a doctor.
我希望取得医生资格。
A degree in English does not qualify you to teach English.
你的英语程度教书不够格。

这里确实很奇怪。不过5个选项都是这样，as to be显然更不对，所以只好这样记住了。

等待NN的解答...

qualify to be: 有资格成为...

I guess