問題詳情
5. Nearly all trees contain a mix of polymers that can burn like petroleum _____ properly extracted.
(A) though
(B) if
(C) is
(D) when it
(A) though
(B) if
(C) is
(D) when it
參考答案
答案：B
難度：適中0.616438
統計：A(3),B(45),C(5),D(17),E(0)
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