Analytical!_For some birds the sense of smell appears to paly a role in navigation, since pigeons with surgically removed olfactory nerves ( were found to have increased difficulties ) in homing. A. were found to have increased difficulties B. have been found to have increased difficulty C. were found to have increasing difficulty D. had been found to have increased difficulties E. have been found to have increasing difficulties 答案是B，我选的A。不明白为什么要用现在完成时，而且感觉困难应该是复数。麻烦老师讲解。出国考试答疑器_GMAT

[Issue Essay]

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Analytical!

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For some birds the sense of smell appears to paly a role in navigation, since pigeons with surgically removed olfactory nerves ( were found to have increased difficulties ) in homing. A. were found to have increased difficulties B. have been found to have increased difficulty C. were found to have increasing difficulty D. had been found to have increased difficulties E. have been found to have increasing difficulties 答案是B，我选的A。不明白为什么要用现在完成时，而且感觉困难应该是复数。麻烦老师讲解。

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阅读241165

解答： sysadmin

提问：

请问陆旭老师，这个图片是网络明星课学生教材37页的第二个qx，我能排除abd，可以说一下c对比e吗？似乎我感觉e这么说可以和conclude that前面平行，但是不平行是不是更简洁，c有什么硬伤吗？之前网上资料说，逗号加连词之后要补出主语they，不过您上课说，这也不一定，还给了个反例，记得好像是after several years of rapid growth, the health care.....那个题e选项，所以我有点困惑

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阅读300528

解答：陆旭老师

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29题为什么选B

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阅读299936

解答：徐小梅老师

Why not E？

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阅读283426

解答：徐小梅老师

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