Several months later, he found Mr. Jackson very difficult .A. to get along withB. getting

Several months later, he found Mr. Jackson very difficult .
A. to get along with
B. getting along with
C. to get along
D. to be gotten along with

(答案→)A. to get along withB. getting along withC. to get along D. to be gotten along with解析：考查find的用法。find+sb.+不定式作宾补。句意“几个月后，他发现杰克逊先生变得很难相处。”he和get along with之间是主谓关系，故用不定式的主动形式。“与某人相处”是get along with，with不能丢掉。故选A。

我明天再问问老师，叫他解释下这个问题