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现在完成时的用法,表示过去发生或已经完成的某一动作对现在造成的影响或结果。此时,常与时间副词already(已经) ,yet(还、已经) ,just(刚刚、仅仅) ,ever(曾经) ,never(从不) ,before(以前)等连用。,选择,1. I havent start it _. A. already B. just C. ever D. yet 2. His brother has been to Stone Forest twice_ he came to Yunnan. A. after B. before C. since D. for,D,B,改写,1. He has eaten a cake already.(否定句) He _ _ a cake _.,hasnt eat yet,