問題詳情

33 Schools, office buildings, factories, and other commercial buildings have benefited from fireprotection ______ systems for over a century.
(A)split
(B)crucial
(C)sprinkler
(D)political

參考答案

答案：C
難度：困難0.32
統計：A(19),B(39),C(48),D(44),E(0)