He his sister to give up the plan for cycling along the Mekong River but failed. A. pers

问题补充：

He his sister to give up the plan for cycling along the Mekong River, but failed.

A. persuaded

B. tried to persuade

C. advised

D. Both B and C

答案：

A. persuaded

B. tried to persuade

C. advised

(答案→)D. Both B and C

解析：原句意思是，他劝他的姐姐放弃骑自行车沿湄公河旅行的计划，但是失败了。根据“but failed”可知，劝说失败了，persuade sb. to do sth. 指说服某人做某事，与下文矛盾，故排除A，try to persuade sb. to do sth. = advise sb. to do sth.所以选D。