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...
If I were you, I would work harder. 三、现在完成时(动作始于过去,持续到现在,并可能继续下去) has / have done →has / have been done 常搭配的时间状语:lately, recently, in/over/during the past/last few days, these days, so far, by now, up to now, till ...
34.All that can be done ___. A)have been done B)have done C)has done D)has been done 35.A person beating a drum or blowing a trumpet causes vibrations in the air ___ sound waves. A) calls B) called C) is called D) are called 36...
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