So fast____that it's diffcult for us to imagine its speed.A.light travelsB.travels the lightC.do light travelsD.does lig
问题描述：
So fast____that it's diffcult for us to imagine its speed.A.light travelsB.travels the lightC.do light travelsD.does light travel正确答案是D,为什么不能选C,为什么这里要用does
答
So fast____that it's diffcult for us to imagine its speed.A.light travelsB.travels the lightC.do light travelsD.does light travel
选D
这是一句so放句首的半倒装句
助动词要提前
因为还原后是【the light travels so fast】
主语是light,是第三人陈单数,所以用does