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
【正确答案】
D
【答案解析】
[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。
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