It seems oil______from this pipe for some time. We'll have to take t-考呗网

单选题 It seems oil______from this pipe for some time. We'll have to take the machine apartto put it right.

A．leaked
B．is leaking
C．had leaked
D．has been leaking

【答案】D。解析：本题考查的是现在完成进行时，它强调在从过去到现在的时间里，动作或状态一直持续或一直反复出现。句意为“看来，这个管道漏油已有一段时间了，我们将不得不拆卸机器排除故障”。根据s。ems和for some time判断使用现在完成进行时，故选D。

1 There is a real possibility that these animals could be frightened,a sudden loud noise. ______

A．being there
B．should there be
C．there was
D．there have been

2It was not______she took off her dark glasses______I realized she was a famous actress.

A．when ; that
B．until ; that
C．until ; when
D．when ; then

3Several political parties______with each other against higher taxes.

A．associate
B．ally
C．combine
D．unite