摘要:5.引导条件状语从句的连词: if “如果 .引导条件状从.主句用一般将来时.从句则用一般现在时.请区别于if“是否 相当于 whether.引导宾语从句.时态根据语境确定 eg:1)I don't know if it ____ tomorrow. 2)If it tomorrow, I the hills. 3)Joan and Mary haven't seen each other they left school five years ago. A.as B.before C.after D.since

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