1. —Is Peter coming?
—No, he____ his mind after a phone call at the last minute.
A
changes
B
changed
C
was changing
D
had changed
本题考查时态，由明显的时间标志词“at the last minute”确定本题时态为过去式，故选B
理解句子意思并且掌握动时态用法。
过去式和过去完成时的区别。