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问题: So fast ___that it is difficult for us to imagine

So fast ___that it is difficult for us to imagine its speed.
A. light travels
B. travels the light
C. do light travels
D. does light travel
答案选D.请问为什么要选D?为什么这里需要用does?
请帮忙具体分析,非常感谢!

解答:

这是英语的一种语法---“倒装句”;

是指将谓语的一部分如助动词或情态倒装至主语之前。如果句中的谓语没有助动词或情态动词,则需添助动词do, does或did其置于主语之前。

这句话的原来句形是:
Light travels so fast that it is difficult for us to imagine its speed.
为了强调so fast, 使用了倒装句。