摘要:要求掌握动词六种时态的基本结构(一般现在时.一般过去时.现在进行时.过去进行时.现在完成时和一般将来时态)及它们的主要用法和区别.了解过去将来.过去完成时态的基本用法.解题时注意找出关键词.正确判断出时态.按时态结构正确变化动词.注意句子时态的一致性.注意对特殊时态的处理[if条件句, as soon as和not-until的时间状语从句.注意主现(在)].1. - My parents have ever been to Canada. - Really? When there ? A. have they been B. will they go C. had they been D. did they go

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