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
help+do原型吗？ 不懂.. 望有人指点... 感激....
C。。。
恩，help do ，还有就是动词比名词好
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