After Yang Liwei succeeded in circling the earth,_____ our astronauts desire to do is walk in space.

题目

After Yang Liwei succeeded in circling the earth,_____ our astronauts desire to do is walk in space.
A.where B.what
C.that D.how

答案

_____ our astronauts desire to do is walk in space.
这部分是主语从句,do后面缺成分,用what