第8题: [单项选择]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 参考答案:D 答案解析:[解析] 题干的第二句表示将要采取的措施,意味着第一句话“漏油”(leak)的动作发生在过去某一时间,并且直到现在仍在继续。因此,第一句话应采用现在完成时或者现在完成进行时。