2. 外语
  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可知，所填空的时态应有两种选择：现在完成时或现在完成进行时，而A 为过去完成时，故D 为答案。
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