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

四技二專、二技統測◆英文- 102 年 - 102 空軍航空技術學院_甄試入學_二技軍官班：英文#18780

答案：B
難度： 困難

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