I have a ___ getting to the top of the Mountain Tai A questi

題目：

I have a ___ getting to the top of the Mountain Tai A question B problem C difficulty D trouble

解答：

在網上可以查到：have a difficulty in doing 在做某事方面有困難（in 可以省略）,不過詞典中沒有明確說這個是一個固定搭配.而且標註說」通常用作複數的.這個句子有個 a ,總覺得怪怪的.
詞典例句：
I had considerable difficulty （in）persuading her to leave.
I had no difficulty（in）making myself understood.
我在一個外國人交流的網頁上看了一下,他們說他們常用的是
① have trouble doing
② have difficulty doing
③ have a problem/ problems doing
而且這三個都表示類似的意思.（這道題好糾結啊,那個a,還有這三個差不多的單詞）
他們是這樣說的原句：
They both could mean the same thing,or not.If you say:He has a problem in doing something,it may mean that a.he doesn't want to do something or b.he has difficulty doing something.For example:He has a problem with going to the movies tonight because he has a lot of work to do at home.(He has questions about it; he has a mental problem about it,in other words.)
All of the following mean the same thing,too:
She has problems doing math problems.
She has a problem with math,in general.
She has problems/difficulties in math.
She has trouble doing math.
She has problems in focusing her attention on math.
There are many ways to say the same thing.
I hope I haven't confused you.
也就是說,很少在difficulty 和 trouble 前面加「a」,如果我選,我更傾向於【B】
就當作是給你提供的參考吧……好丟臉……說的不明不白的