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高中

(C)に当てはまる単語を選び形を変えて入れる問題です。入る単語はlookで、回答はlooksでしたがなぜlookedがダメなのかが分かりません。理由を教えて欲しいです。

d times ir way in the early morning hours. Another concern has to do with the cost implications of delaying school start - an ever-present issue in the age of increasingly tight school budgets, and decreasing tax revenues. The move could lead to a range of initial up-front costs, with budget-watchers worried most ( 2 ) costs/associated with changing bus schedules and additional lighting for athletic fields because after-school activities would be pushed later in the day. However, our recently released research for the RAND Corporation ( B ) that delaying school start times to 8:30 a.m. could actually result in significant economic statewide benefits that would be realized within a matter of years. Over the span of about a decade, the United States could stand to make financial gains of around $83 billion if teenagers were able to get more sleep. In California alone the financial gains would be just over $10 billion. Within even two years, most states would break even in terms of the initial costs of the move versus the economic benefits. These gains are based on a macroeconomic model that ( C ) at two key effects of better-rested teens: improved academic performance and reduced motor vehicle crashes. In terms of academic performance, research published ( 3 ) the apt title

解答

このlookは〜〜に注目した、という意味だと思います。よく休息(睡眠)のとれたティーンたちの二つのキーエフェクトに注目したミクロ経済のモデル、という訳になります。この文において、注目されたのは二つのキーエフェクトで、行為をしたのはミクロ経済のモデルですので、looksになります。looked は過去分詞として使いたいならthatが不要またはthat is となるはずで、過去形として使いなら、大きな文のthese gains are と時制を合わせる必要があるのでここでは不適です。

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