問題詳情

13 We thought our experimental design was flawless, but it turns ________ that we failed to control animportant variable.
(A)in
(B)on
(C)out
(D)down

參考答案

答案:C
難度:適中0.453333
統計:A(9),B(15),C(34),D(13),E(0)

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