415. It is the school officials who are in the best position to decide which subjects would provide the breadth and balance of a good curriculum for all students.
最有資格安排學習課程，從而讓所有學生都能接受到既全面又均衡的課程教育的，莫過于學校領導。

六級詞匯講解:
本句利用it is...that/who...的強調句型突出school officials的職能。in the best position指“處于最好的位置，最有資格做某事”。連接代詞which引導的名詞性從句作decide的賓語。

句型拓展:
It is interpersonal skills rather than professional skills that count in your career.
對于你的事業而言，更重要的是個人交際能力，而不是專業能力。
It was not until he arrived at the station that he realized he had left his tickets at home.
直到到了車站，他才發現自己把票忘在家里了。
It was lack of money，not of effort，that defeated their plan.
導致他們的計劃失敗的，不是努力不夠，而是缺乏資金。