問題詳情
21.My car made strangejioises, sputtered to a stop, and then wouldn’t start again. Fortunately, the mechanic at my garage _________ the source of the problem.
(A) to discover
(B) discovered
(C) was discovered
(D) has been discovered
參考答案
答案：B
難度：適中0.425532
統計：A(3),B(20),C(13),D(11),E(0)