1. Scientists have suggested that once every 10 million years or so a truly colossal object from space cuts through the atmosphere and slams into Earth, sending up a global pall of dust that blots out the Sun, alters the climate, and changes the course of evolution by killing off many plant and animal species.
(A) sending up a global pall of dust that blots
(B) thus sending up a global pall of dust to blot
(C) thereby sending up a global pall of dust to blot
(D) and that sends up a global pall of dust, blotting（A）
(E) which sends up a global pall of dust, blots
请问C 为啥不好？
平行结构，如果用C句的to blot,后面也都需要不定式，to do ,do and do.
这里是does,does and does.
另外thereby表因果，这里原句是伴随状态。所以thereby多余。
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