大全-336. Ideally, the professional career diplomat should help in the ongoing maintenance of an effective American foreign policy despite changes in administration.

(A) in the ongoing maintenance of

(B) in the maintaining of

(C) maintain

(D) to maintain and continue（C）

(E) the maintenance of

请问C中help和maintain两个动词连用是什么用法啊？还有其他的例子没有？谢谢！