过去完成时(had done) 表示在过去的某个时间或动作以前已经发生的动作或已经存在的状态。就是我们常说的"过去的过去"。 Until then, his family hadn t heard from him for six months. 到那时为止,他家里已经有六个月没得到他的消息了。 07 过去将来时(would do) 表...
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) haven't sold。 B) 表示从过...
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