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

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

答案D

解析考查时态。根据seems和for some time判断应使用现在完成进行时。现在完成进行时强调在从过去到现在的时间里，动作或状态一直持续或一直反复出现。句意为“看来，这个管道漏油已有一段时间了，我们将不得不拆卸机器排除故障”。故选D。

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