I feel very excited?the thought of joining my family in a week．

I feel very excited?the thought of joining my family in a week．
A、On
B、for
C、At
D、in
【正确答案】：C
【题目解析】：【考情点拨】考查固定短语。 【应试指导】句意：一想到一周后就能和家人在一起，我就很激动。be excited at sth．意为“对某事感到兴奋”，故选C。