TOEFL PPの中でわからない問題が2題あります。
1題目:
The Mississippi riverboat, which evolved from simpler steamship of the early 1800's, became the dominant form of passenger transport on the Mississippi River.
こんにちは。
Powerprepでわからない問題があったので質問させて下さい。
4. Perhaps the most significant postwar trend was the decentralization of cities throughout the United States,
_____ when massive highway-building programs permitted greater suburban growth.
a)and accelerated a phenomenon
b)a phenomenon that accelerated
c)accelerating a phenomenon which,
d)the acceleration of which phenomenon
解答は(b)のa phenomenon that acceleratedです。
私が選んだのは(a)で単純に2文を繋ぐのに接続詞が必要だと思ったからなんです。Perhaps the most significant postwar trend was the decentralization of cities throughout the United States, [and (the trend) accelerated a phenomenon] when massive highway-building programs permitted greater suburban growth.
解答を見た後は、なるほど!a phenomenon はthe decentralization
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