改错:Mary sat down (A:beside) me (B:a) moment,after Tom was (C:gone)

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改错:Mary sat down (A:beside) me (B:a) moment,after Tom was (C:gone)

改错:Mary sat down (A:beside) me (B:a) moment,after Tom was (C:gone)
改错:Mary sat down (A:beside) me (B:a) moment,after Tom was (C:gone)

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

B处加for

was 要改成 had