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[Sentence Correction]
试题详情
题目：
Some anthropologists believe that the genetic homogeneity evident in the world's people is the result of a "population bottleneck"—at some time in the past our ancestors suffered an event, greatly reducing their numbers and thus our genetic variation.
选项:
A、at some time in the past our ancestors suffered an event, greatly reducing their numbers
B、that at some time in the past our ancestors suffered an event that greatly reduced their numbers
C、that some time in the past our ancestors suffered an event so that their numbers were greatly reduced,
D、some time in the past our ancestors suffered an event from which their numbers were greatly reduced
E、some time in the past, that our ancestors suffered an event so as to reduce their numbers greatly,
答案:
B
提问：
老师请解释下这道题，特别是A和d，另外是不是解释一个名词 必须也是一个名词不能是句子啊
解答：
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提问：
对于正确选项不理解，破折号 +that 表示什么？原先做题思维看到这么奇怪的表达直接就误杀了，最后错选了D。谢谢~
解答：
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提问：
老师讲一下，C和为什么不行D
解答：
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提问：
B和D不知道选哪个 感觉读得都很顺
解答：
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提问：
我选的是A，问1：A的reducing所修饰的不应该是event，即event导致了数量和变量的减少？ 问2：破折号后面为什么可以跟that，不理解.
解答：
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阅读2414
提问：
为什么要加that呢？D就是因为没有that才错的吗？
解答：
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