问题
选择题
It was not until she got home __ Mary realized she had left her books in the classroom.
A．when
B．that
C．where
D．before
答案
答案：B
本题的it是代替句尾的主语从句，主语从句为陈述句，可用关系词that连接主语从句，故本题选B。
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It was not until she got home __ Mary realized she had left her books in the classroom.
A．when
B．that
C．where
D．before
答案：B
本题的it是代替句尾的主语从句，主语从句为陈述句，可用关系词that连接主语从句，故本题选B。