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[Sentence Correction]
试题详情
题目：
By sucking sap from the young twigs of the hemlock tree, tree growth is retarded by the woolly adelgid, causing needles to change color from deep green to grayish green and to drop prematurely.
选项:
A、tree growth is retarded by the woolly adelgid, causing needles to change color from deep green to grayish green and to drop
B、tree growth is retarded by the woolly adelgid, and this causes the color of needles to change from deep green to grayish green, and their dropping
C、the woolly adelgid retards tree growth, which causes needles to change color from deep green to grayish green, and dropping
D、the woolly adelgid retards tree growth, causing needles to change color from deep green to grayish green and to drop
E、the woolly adelgid retards tree growth, and this causes the color of needles to change from deep green to grayish green, and then their dropping
答案:
D
提问：
逻辑题641: Last year a global disturbance of weather patterns....
解答：
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提问：
老师，在D选项中change和drop为什么能构成并列？E中的先change后drop不会更合适吗？
解答：
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提问：
其他都明白，还想问下这e选项里的this是不是用的不对，this不能指代整件事情？
解答：
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提问：
可以详细解释一下E选项中的and的用法吗？为什么their dropping是和to change并列？
解答：
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提问：
逻辑题641: Last year a global disturbance of weather patterns....
解答：
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阅读2813
提问：
虽然一个主动，一个被动，但看前后句都是在讲树的生长，所以以tree growth开头更直接。
解答：
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