2. 考研
  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、is leaking
C、leaked
D、has been leaking
答案D
解析 根据句中的时间状语for some time，空格上的时态可有二种选择：现在完成时与现在完成进行时。
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