I began to collect stamps ten years ago.把它转换为同义句.急把它转换为 I —— —— —— stamps —— ten years ago.的形式,

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I began to collect stamps ten years ago.把它转换为同义句.急把它转换为 I —— —— —— stamps —— ten years ago.的形式,
I began to collect stamps ten years ago.把它转换为同义句.急
把它转换为 I —— —— —— stamps —— ten years ago.的形式,

I began to collect stamps ten years ago.把它转换为同义句.急把它转换为 I —— —— —— stamps —— ten years ago.的形式,
have been collecting,since 用完成进行时表动作一直持续到现在,并可能持续下去

have been collecting, since