问题
选择题
The urge to go abroad for further study is strong, but it was not until last summer ________ I knew how powerful it could be.
A．who
B．that
C．where
D．before
答案
答案：B
强调句用来引起他人注意你所谈的内容，其结构是：“It is/was＋被强调的部分＋that/who＋句子剩下的部分”。分析句子结构可知，but后面的分句是强调句结构，被强调的部分是时间状语，故答案选B。