It seems oil leaves from this pipe for some time. We’ll have to take the machine apart to put it right.

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问题 It seems oil leaves from this pipe for some time. We’ll have to take the machine apart to put it right.

选项 A、had leaked
B、is leaking
C、leaked
D、has been leaking

答案D

解析时态应用本句意为：油管漏油好像有一段时间了，我们必须拆开机器排除故障。题干第2句表示将要采取的措施，意味着第l句话“漏油”(leak)的动作发生在过去某一时间，并且持续到现在为止仍在继续，因此第1句话应用现在完成时或现在完成进行时。因此D为答案。

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