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[Sentence Correction]
试题详情
题目：
Humans have been damaging the environment for centuries by overcutting trees and farming too intensively, and though some protective measures, like the establishment of national forests and wildlife sanctuaries, having been taken decades ago, great increases in population and in the intensity of industrialization are causing a worldwide ecological crisis.
选项:
A、though some protective measures, like the establishment of national forests and wildlife sanctuaries, having been taken decades ago, great increases in population
B、though some protective measures, such as the establishment of national forests and wildlife sanctuaries, were taken decades ago, great increases in population
C、though some protective measures, such as establishing national forests and wildlife sanctuaries having been taken decades ago, great population increases
D、with some protective measures, like establishing national forests and wildlife sanctuaries that were taken decades ago, great increases in population
E、with some protective measures, such as the establishment of national forests and wildlife sanctuaries, having been taken decades ago, great population increases
答案:
B
提问：
老师，这道题最后我在AB两个选项里面纠结，A选项的差异在于时态，那应该怎么去考虑呢？另外老师，我对进行的完成时态having been的用法一直不知道该怎么把握
解答：
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阅读2885
提问：
老师，这道题最后我在AB两个选项里面纠结，A选项的差异在于时态，那应该怎么去考虑呢？另外老师，我对进行的完成时态having been的用法一直不知道该怎么把握
解答：
点赞2
阅读2886
提问：
还是b和d不知道选哪个，听了上一个语音解释，但是语义是national forests与wildlife sanctuaries并列，并不是establishment与wildlife sanctuaries呀？还想问那个were taken在句中属于很么性质？
解答：
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阅读2961
提问：
B D比不出来
解答：
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