介词after 已经说明 先后 关系 所以 后面用 动名词的一般形式即可 故答案是A
动名词的完成时 表示动作 发生在前 作介词宾语 与after意思重复
故 如果选B的话 须把 after 去掉 变成现在分词的完成式作时间状语 表示动作发生在前
Rewrite each of the following sentences with the "-ing" part
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