It seems oil( )from this pipe for some time.We'll have to take the machine apart to put itright.
考试：
科目：（在线考试）
问题：
A：had leaked
B：is leaking
C：leaked
D：has been leaking
答案：
解析：
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It seems oil( )from this pipe for some time.We'll have to take the machine apart to put itright.
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