問題詳情
Turn off the water supply before carrying out repairs, __________ it's just a minor adjustment to the float arm.
(A) otherwise
(B) unless
(C) whereas
(D) therefore
(A) otherwise
(B) unless
(C) whereas
(D) therefore
參考答案
答案：B
難度：適中0.492386
統計：A(42),B(97),C(41),D(7),E(0)
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