一道高一改错题How does she keep smiling after all that she has got through?请说明理由

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一道高一改错题
How does she keep smiling after all that she has got through?
请说明理由

does 改成could

把that去掉,after all 固定短语,

that 去掉

若用keep smiling,那smile这个动作从过去某时刻就开始了,after后面的现在完成时态就与前面的时态矛盾了!于是,需要调整的可以有三处:主句时态、介词after和从句时态。
1.How could she have kept smiling with all that she has got through?
2.Why doesn't (shouldn't or c...

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若用keep smiling,那smile这个动作从过去某时刻就开始了,after后面的现在完成时态就与前面的时态矛盾了!于是,需要调整的可以有三处:主句时态、介词after和从句时态。
1.How could she have kept smiling with all that she has got through?
2.Why doesn't (shouldn't or couldn't) she keep smiling after all that she went through?

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How改为Why