题目内容
It seems that oil______from this pipe for some time.We’ll have to take the machine apart to put it right.
- A.had leaked
- B.is leaking
- C.leaked
- D.has been leaking
D
考查时态。现在完成进行时表示从过去一直延续到现在的动作,而且此动作还有可能延续下去。
考查时态。现在完成进行时表示从过去一直延续到现在的动作,而且此动作还有可能延续下去。
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