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SC
1. XX play an important role in ....... , aiding ..........; penetrating(具体单词可能不准）.........; and indirectly helping to contribute....
B) penetraing..........;and indirectly help to contribute
C)penetraing..........;and they indirectly help contributing....
D) and they penetrate.............; and indirectly help to contritute.....
E) and they penetrate...........; and indirectly helping contritute.....
Ans: 分号前后必须是独立的句子，可以猜测是D
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2. SC：和PREP挺像的，但好像没有PREP难。
遇到两三道比较的，其中有一个more than three times as many …….as , 有的选项用了than, 错的比较明显。
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3. 还有两三道考主谓一致的，有一个是cattle, 跟谓语动词的单复数。
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