Question

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

[　　]

A．where

B．what

C．that

D．how

Answer 1

答案：B
解析：

what引导从句,在句中作主语。该题中C选项具有较强迷惑性，但that引导主语从句时，that不作成分，故缺主语。