Though there were great difficulties _______, he never gave up.
A. in overcoming B. to overcome
答案是选不定式(B),但为什么不能选 in doing sth (A)呢?英语不是有一个句式是 there is some difficulty (in) doing sth 吗?
《高考英语备考1号·速效编》
《高考英语备考1号·写作编》
《高中英语晨读晚记》
《高中英语错题笔记》
《零起点考大学英语》