It seems oil______from this pipe for some time. We’ 11 have to take the machine

游客2024-08-18 33

问题 It seems oil______from this pipe for some time. We’ 11 have to take the machine apart to put it right.

选项 A、had leaked
B、leaked
C、is leaking
D、had been leaking

答案 D

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Itseemsoil______fromthispipeforsometime.We’11havetotakethemachine