Have you finished your homework yet?No,but I ____ (doing) it yesterday afternoon

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Have you finished your homework yet?No,but I ____ (doing) it yesterday afternoon
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Have you finished your homework yet?No,but I ____ (doing) it yesterday afternoon
Have you finished your homework yet?No,but I ____ (doing) it yesterday afternoon

Have you finished your homework yet?No,but I ____ (doing) it yesterday afternoon
should have done
根据语意,回答是NO,也就是说我还没完成作业;但后面跟了个BUT,说明我不应该没做完
因此只能用虚拟语气should have done表过去应该做但却没做的事
如果用had been doing,后面要用since yesterday afternoon

had been doing

was doing

had been doing 是正确的

Have you finished your homework yet? No,but I _did___ (doing) it yesterday afternoon
理由: 过去时间 用过去式,没有明确的某一时刻限制 用一般时
【学习宝典】

No,but I 【was doing】 it yesterday afternoon

填did,过去有表示过去的时间状语,yesterday,所以用一般过去时