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とある TOEFL文法問題なのですが、解答を見てもわからないので理由を教えてください。よろしくお願いします。
1.Usually, the more skilled an athlete ----- the more effortless the athlete's movements appear to be.
(A) What is (B) that is (C) that it is (D) is
正解 D
2. Flower oils are ---- of the ingredients used in making perfume.
(A) among expensive (B) among the most expensive (C) beng most expensive (D) expensive
正解 B
4. [During early] nineteenth century, the building [of] canals and railroads [strengthened] the state of Indiana's links [with] the eastern United States.
正解 A
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