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
(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)
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