B. 这里考了半倒装的用法，正常语序是：I felt it so difficult to live....
以下资料总结了半倒装的用法：
半倒
1 as取代though的让步状语匆遽，引起的句子成分提前
例句1（表语提前）：Poor as he is,...
例句2（表语提前，去掉a）：Baby as he is,...
例句3（状语提前）：Hard as he worked,...
例句4（谓语提前，可保留情态动词）：Try as he may,...
2 疑问句中的提前，借助助动词、情态动词提前（不用例子了吧？）
3 含有否定意义的词语在句首（否定词有never,not,not only,little,seldom,hardly,few,nowhere,scarcely,neither,nor,no longer,not untill,not once,in no way,in no case,ar no time,no sooner than,hardly when等等）
特别注意，in no time 的意思是马上，不含否定意思，因此它置句首句子不倒装！！！
例句：Not only was there no electricity,but also no water.
Never will he forgethis ferst time to take a plane.
Hardly had I got out of the house when it began to rain.
4 Only修饰的副词、介词短语或状语从句置句首时
例句：Only then did I begin my work.
Only if you ask many different questions will you acquire all the information.
Only in this way can you learn from your friends.
5 so,neither,nor引起的句子，表示前面的情况也适合另一人或同一人的另一情况时。
例句：My sister enjoys travelling. So do I.
I don't know and nor do I care.
前后的谓语要保持时态一致。
如果前面主句中既有谓语动词又有系动词，或者一半肯定一半否定，则用句子So it is/was with sb.
6 在so/such...that...结构中，so/such放句首时
例句：So proud was he that he never listened to any advice.
Such a kind person is he that...
7 虚拟条件从句省略if时（只有if后面跟should,had,were时可省略if）
例句：Should you need more information,please let me know.
Had Mark invited me I would have been glad to come.
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