how long has she been helping her husband?___she was a young
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how long has she been helping her husband?___she was a young woman.
1 from then 2 since 3 for 4 by then
请问选择哪一个,及分别说出每个为什么对与错
1 from then 2 since 3 for 4 by then
请问选择哪一个,及分别说出每个为什么对与错
![how long has she been helping her husband?___she was a young](/uploads/image/z/3409804-28-4.jpg?t=how+long+has+she+been+helping+her+husband%3F___she+was+a+young)
选2 since 自从她还是个年轻女子开始.用于现在完成进行时
1.From then 本身就是现在完成时或现在完成进行时的时间状语,then 与she was a young woman重复
3.for要加时间段,而she was a young woman 是时间点
4.by then 用于过去完成时
1.From then 本身就是现在完成时或现在完成进行时的时间状语,then 与she was a young woman重复
3.for要加时间段,而she was a young woman 是时间点
4.by then 用于过去完成时
how long has she been helping her husband?___she was a young
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