There's no way of knowing why one man makes an important discovery ______

問題詳情

32. There's no way of knowing why one man makes an important discovery _______ another man, also intelligent, fails.
(A) since
(B). if
(C). as
(D). while

參考答案

答案：D
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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