单选题It seems oil ______ from this pipe for some time. We’ll have to take the machine apart to put it right.Ahad leakedBleakedCis leakingDhas been leaking
单选题
It seems oil ______ from this pipe for some time. We’ll have to take the machine apart to put it right.
A
had leaked
B
leaked
C
is leaking
D
has been leaking
参考解析
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。
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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