请问一道英语四级题目 After( )seemed an endless wait,it was his turn to step into the doctor's office.A.what B.that C.it D.there

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请问一道英语四级题目 After( )seemed an endless wait,it was his turn to step into the doctor's office.A.what B.that C.it D.there
请问一道英语四级题目
After( )seemed an endless wait,it was his turn to step into the doctor's office.
A.what B.that C.it D.there

请问一道英语四级题目 After( )seemed an endless wait,it was his turn to step into the doctor's office.A.what B.that C.it D.there
After( )seemed an endless wait,it was his turn to step into the doctor's office.
A.what B.that C.it D.there
答案选A.
After作为一个介词,后面要加名词作介词宾语,what seemed an endless wait是一个介词宾语从句,可以起到名词的替代作用
that 在宾语从句中不可以放在介词后面,若选it则after后面直接跟的变成了一个完整的句子,不合语法,there 同样会使after后的部分变成一完整句子