题目内容：

I didn't go to this party last night,because ___I changed my mind.
A.on a second though B.on second thoughts C.by second though D.on the second though
答案～原因

优质解答

C.on second thoughts
理由：on second thoughts 意为“进一步考虑后,经再三考虑之后,经重新考虑”,对应后面的话“我改变了主意”.

追答：

ѡBд����