问题
选择题
When the students heard the alarm, they all hurried to they thought was an emergency exit door．
A．what
B．which
C．where
D．who
答案
答案：A
题目分析：此处to是介词，其后是介词的宾语从句，what在宾语从句作主语。句意：当学生们听到警报声，他们都急忙冲向他们认为的应急出口。
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