Question

When the audience heard the alarm, they all hurried to        they thought was an emergency exit door.

A．what

B．which

C．where

D．who

Answer 1

A

考查名词性从句。What连接宾语从句从句they thought was an emergency exit door并作从句的主语。 句意当观众听到警报声他们跑向紧急出口处。