I didn't go to her birthday party yesterday evening ,because ___ I changed my mind .

问题描述:

I didn't go to her birthday party yesterday evening ,because ___ I changed my mind .
A.on a second thought B.by second thoughts
C.on second thoughts D.on the second thoughts
解释下原因,谢.

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”.