問題詳情

40.The scientist discovered________during investigations that a few simple food additives couldremove virtually ail methane produced by cows.
(A)at chance
(B). by chance
(C). on chance
(D)in chance)

參考答案

答案:[無官方正解]
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)

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