问题补充：
He asked us to him carrying through their plan.
A. assist; with
B. help; to
C. assist; in
D. help; with
答案：
A. assist; with
B. help; to
(答案→)C. assist; in
D. help; with
解析：考查固定搭配。固定搭配help/assist sb with sth/in doing sth帮助某人做某事；句意：他请求我们帮助他们执行他们的计划。C项正确。其余三项的搭配都是错误的。
