This is the very bus ()we will go to the theater.
问题描述：
This is the very bus ()we will go to the theater.
A.in that B.where C.by which D.on which 为啥?
答
这就是我们要坐的去剧院的公交.
变成陈述句就好理解了：
We will go to the theater on this bus.
我们会做这趟公交去剧院.介词用 on,针对哪一辆公交提问要用 which不是by bus 吗具体哪辆是 on the/this/that bus