My father wrote me a letter ___ harder.A.encouraging me to study B.encouraged me to study

问题描述:

My father wrote me a letter ___ harder.A.encouraging me to study B.encouraged me to study

A 因为一个句子里出线两个动词如果不是定语从句就应该考虑是伴随状况,伴随状况应该用动词的ing形式.