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

解析看样子油从这个管道渗漏出来已经有一会了，我们得把机器拆开来修好它。本题考查时态的用法。leak为表语从句的谓语动词，由时间状语for some time可知动作已经持续了一段时间。且还在继续，因此要用现在完成进行时，故选D项。

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