Question

______delighted me most was________my son was admitted to Beijing University.

A．That, what

B．That , that

C．What, that

D．What, what

Answer 1

C

试题分析：考查名词性从句。第一空what引导主语从句what delighted me most，在句中做主语；第二空that引导表语从句，在句中不充当任何成分，只起引导作用。句意：最让我开心的是我的儿子被北大录取了。故C正确。
点评：what在名词性从句中做主语，宾语，表语或者定语；that在名词性从句中不充当任何成分，只起连接作用。