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

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itseemsoil_____fromthispipeforsometime,we''llhavetotakethemachineaparttoputitrightA.hadleakedB.isleak

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

it seems oil_____from this pipe for some time ,we'll have to take the machine apart to put it rightA.had leaked B.is leaking C.leaked D.has been leaking我选C错了,请问我错在哪了?
D
for some time表示动作持续一段时间 用现在完成进行时

d
这里强调一段时间内正在发生油从管子里流出来了