問題詳情

39. We should keep our cellphones in the silent mode ________ the audience will enjoy the performancewithout interruption.
(A) which
(B) so that
(C) as if
(D) unless

參考答案

答案:B
難度:簡單0.74522
統計:A(434),B(3118),C(434),D(198),E(0)

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