用法:现在正在进行的动作。 3. 现在完成时(have done) 用法: A) 表示动作到现在为止已经完成或刚刚完成。 例:I bought a new house, but I ___ my old one yet, so at the moment I have two houses. A) didn't sell B) sold C) haven't sold D) would sell 答案是C) ...
2. 可以省去谓语部分,保留主语和be、have等助动词 Susan has done as much housework as you have. (省去了done.) 3. 可以省去主语和谓语,只剩下状语 It is not as cold in Beijing as in Datong. 北京的天气没有大同冷。 4. than从句也可以省去整个谓语部分,保留主语...
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