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板凳
楼主 |
发表于 2015-6-9 08:20:28
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只看该作者
寂静群里争议的是137,我个人认为是A选项,
The past perfect tense is used to express that an action was completed before a point of time in the past. This point can be implied or expressed with a time expression or a clause with a verb in the past simple tense:
They had all arrived by 10 o'clock.
附上原文链接http://www.nytimes.com/1999/01/10/us/in-new-discoveries-a-planetary-mystery.html
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