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

答案D

解析现在完成进行时表动作已经持续了一段时间并且还在进行，与for some time相对应。

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C类竞赛（非英语专业本科）

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