题目内容

It seems that 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．leakedD．has been leaking
D
考查时态。现在完成进行时表示从过去一直延续到现在的动作，而且此动作还有可能延续下去。
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