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

游客2024-08-16 46

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、leaked
C、is leaking
D、has been leaking

答案 D

解析现在完成进行时表动作已经持续了一段时间并且还在进行，与for some time相对应。

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尽管那些机器不能移动，他们也被称为机器人。(eventhough)Thosemachinesarealsocalledrobotseventho