Question

       is surprising to us is that Tom can speak English fluently as though he were a native speaker.

A．What

B．That

C．Which

D．As

Answer 1

A

试题分析：考查名词性从句中的主语从句。       is surprising to us是主语从句，从句缺少主语用what；构成What... is that...句型。that在名词性从句中不作成分；which指哪一个；as引导非限制性定语从句，本句没逗号。故选A。