【题目】Difficult as the task was _________, they never gave up and kept trying all the time.
A. to be accomplishedB. to accomplish
C. being accomplishedD. to have been accomplished
在线课程【答案】B
【解析】考查特殊句式句意：任务尽管很难去完成，他们却从未放弃并一直在尝试。此题是as引导的让步状语从句与“sth+be+adj+to do”句式的结合，在“sth+be+adj+to do”句式中，动词不定式用主动形式表示被动含义，故选B适合。