問題詳情

34.It is unfortunate that, due to a glitch in the computer system, several of our most valued customers ________ incorrectly.
(A) bill
(B) have billed
(C) was billing
(D) were billed

參考答案

答案:D
難度:適中0.673122
統計:A(158),B(663),C(158),D(2016),E(0)

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