To __,only about five hundred people have travelled into space

问题描述:

To __,only about five hundred people have travelled into space
To _____,only about five hundred people have travelled into space.
A.day B.date C.now D.nowadays

选B To date 至今
怎么说呢,这是固定用法,A、C没有这种用法.如果要选D不要加to,直接是nowadays,而且nowadays只表示现在,没有“至”现在的意思