They want to visit City Park.That's______________.

问题描述:

They want to visit City Park.That's______________.
A.I want to do B.what they want to do
C.what I want do D.where they want to do
请顺便说明理由,解释一下整句句子的意思

B.他们想去城市公园.这正是他们想做的.