- 单选题It seems oil( )from this pipe for some time.We'll have to take the machine apart to put itright.
- A 、had leaked
- B 、is leaking
- C 、leaked
- D 、has been leaking
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参考答案【正确答案：D】
该句时间状语“for some time”表示“已有一段时间”，与has been leaking相呼应。译：看起来这管子漏油已有一段时间了，我们必须把机器拆开修理一下。had leaked虽然也可以表示一段时间的持续，但与后一句we'll...时态和逻辑无法对应。
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