問題詳情

13.Good ____________ is a prime necessity for the avoidance of dust, stain and tainting damage.
(A)air
(B)air-condition
(C)fresh air
(D)ventilation

參考答案

答案:D
難度:適中0.428571
統計:A(1),B(8),C(19),D(21),E(0)

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