It seems oil ______ from this pipe for some time. We’ll have to take the machine

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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、is leaking
C、leaked
D、has been leaking

答案 D

解析根据句中的时间状语for some time可知，所填空的时态应有两种选择：现在完成时或现在完成进行时，而A 为过去完成时，故D 为答案。

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