摘要:按语法规则.ago只能与一般过去时连用.但在since three years ago这类短语中能与现在完成时态连用.因为three years ago构成一个名词短语.共同作since的宾格.意为“自从三年前以来 .例如: ① He has been here since three years ago. ② I have taught English in this school since twenty years ago.

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