问题补充:
Thank you very much for the trouble you have taken me with my English.
A. helping
B. to help
C. help
D. helped
答案:
A. helping
(答案→)B. to help
C. help
D. helped
解析:考查短语:take the the trouble to do 不辞辛苦做某事,题中含有一个定语从句,the trouble是先行词,后面的从句中you have taken后缺少宾语,省略了关系代词which/that,句意:非常感谢你不辞辛苦的帮助我的英语。所以选B。