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单选题
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

leaked

C

is leaking

D

has been leaking


参考答案

参考解析
解析:
现在完成进行时表动作已经持续了一段时间并且还在进行,与for some time相对应。
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