問題詳情

9. Air, water, and food are considered ______ to human life.
(A)indistinguishable
(B) illegitimate
(C) illegible
(D)indispensable

參考答案

答案:D
難度:適中0.596774
統計:A(9),B(5),C(3),D(37),E(0)

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