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

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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240950

解答： sysadmin

提问：

第二个式子，我认为是 n=100K+67, 为什么是n=100k+63

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解答：徐小梅老师

英吉老师这个选啥好像没看到视频里讲麻烦解释一下哈谢谢老师

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解答：英吉老师

提问：

请陆旭老师回答一下。这个题用picking numbers解答是最佳最快方案嘛？如果picking numbers的话，咋样想到啊？如果推理的话，应该怎么考虑呢？

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解答：徐小梅老师

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