问题描述：
it seems oil_____from this pipe for some time ,we'll have to take the machine apart to put it right
A.had leaked B.is leaking C.leaked D.has been leaking
我选C错了,请问我错在哪了?
A.had leaked B.is leaking C.leaked D.has been leaking
我选C错了,请问我错在哪了?
问题解答：
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