It seems oil ________ from this pipe for some time. Well have to take the machine apart to put it right. ( 章节：1 难度：3)
- A、had leaked
- B、is leaking
- C、leaked
- D、has been leaking
正确答案:D
答案解析:有
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It seems oil ________ from this pipe for some time. Well have to take the machine apart to put it right. ( 章节：1 难度：3)
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