問題詳情

29. As a safety measure, the detonator for a nuclear device may be made of two pieces of equipment, _____ is controlled by adifferent employee.
(A) each of them
(B) each
(C)both of them
(D)each of which

參考答案

答案:D
難度:適中0.541667
統計:A(23),B(3),C(1),D(39),E(0)

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