题干
—Linda, I called you this morning, but nobody answered the phone．
—I'm sorry, I________ football with my friends then．
A：play
B：played
C：am playing
D：was playing
答案(点此获取答案解析）
D
若（1-ai ）( 3+2i )为纯虚数，则a的值为 （ ）
