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  3. It seems oil ______ from this pipe for some time. We’ll have to take the machine apart to put it right.

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

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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、leaking
C、leaked
D、has been leaking
答案D
解析
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