改错:Mary sat down (A:beside) me (B:a) moment,after Tom was (C:gone)
问题描述:
改错:Mary sat down (A:beside) me (B:a) moment,after Tom was (C:gone)
答
was 要改成 had
答
B处加for
答
was 改成had 过去完成时表示过去的过去