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标题: GMATPREP一题请教 [打印本页]
作者: zijunandyy 时间: 2006-4-4 20:59
标题: GMATPREP一题请教
[attachimg]46001[/attachimg]
答案是C,D为什么错?
作者: yaoyao99 时间: 2006-4-5 00:30
I think
1. The past perfect tense had to be paired with a past tense to indicate the sequence of events.
2. c is more straightforward, comparing to D.
作者: shanexin 时间: 2006-4-6 22:04
我觉得,C比D好的可能的理由是:动作的发出者是否确定。C中更准确的表达了scientists学会了人工合成荷尔蒙,而不一定是scientists来remove,而D改变了句意,scientists既学会合成荷尔蒙,而且亲自操刀remove
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