单选题 We are (at) a critical point in our nation's history and we cannot go back as individuals or (as a country) to (what) .we were ten, five or even one year (earlier).

A、 at
B、 as a country
C、 what
D、 earlier

【正确答案】 C

【答案解析】应将关系副词what改为where。表示我们不可能回到过去的某一时间点去(a point in our history)，因为表示的是时间点，而不仅仅是表示时间，所以不能改为 when。