单选题 It was when we were returning home______I realized what a good feeling it was to have helped someone in trouble.

A、 which
B、 that
C、 where
D、 how

【正确答案】 B

【答案解析】解析：句意：正是在我们回家的时候，我才意识到救人于危难是一件多么美妙的事情。强调句型题。分析句子结构可知，若去掉“it was”和空处句子结构依然完整，由此可推断本句为强调句，其中时间状语从句when we were returning home为被强调部分，空格处则应为连词that。故选。