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Theypreparedman-maderubberasa(n)

練習題2.2W

問題詳情:

Theypreparedman-maderubberasa(n)

They prepared man-made rubber as a(n)_________ for the natural rubber that they could no longer obtain.

A. preference        B. assistant       C. substitute      D. exchange

【回答】

C

知識點:名詞

題型:選擇題