23. 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
請問為什麼答案不是e呢？感覺上好像e比c還平行對稱
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