一般过去时与现在完成时的区别现在完成时强调对现在的影响,不与具体过去时间状语连用,但可与ever,never,before,just,already 连用。一般过去时,表示过去某个时间发生的动作,与具体的过去时间状语连用。eg. yesterdayin 1970just nowa moment ago 等。practice1. I ___C___ my homework an hour ago.A. have, done B. doC. did D. am doing2. I _D____already __D___ my homework.A. am, do B. did, allC. have d...
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