摘要:4.现在进行时与过去进行时(am/ is/ are being +done; was/ were being +done) The machine was being repaired at this time yesterday. 昨天这时.机器正在被修理. The problem is being discussed now. 问题正在被讨论. A bus is being pushed by the passengers. 路人正在推一辆公共汽车.

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