求解一道初中英语单项选择——Did you father begin to work ____he was very young?——Yes,he began to work ____the age of seven.正确答案是when,at我想问的是,第一空为什么不能用since?

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求解一道初中英语单项选择——Did you father begin to work ____he was very young?——Yes,he began to work ____the age of seven.正确答案是when,at我想问的是,第一空为什么不能用since?

求解一道初中英语单项选择——Did you father begin to work ____he was very young?——Yes,he began to work ____the age of seven.正确答案是when,at我想问的是,第一空为什么不能用since?
求解一道初中英语单项选择
——Did you father begin to work ____he was very young?
——Yes,he began to work ____the age of seven.
正确答案是when,at
我想问的是,第一空为什么不能用since?

求解一道初中英语单项选择——Did you father begin to work ____he was very young?——Yes,he began to work ____the age of seven.正确答案是when,at我想问的是,第一空为什么不能用since?
since应该搭配用完成时,如Have your father began to work since .

since是现在完成时的标志词,有出现“主+have+done”结构或“It‘s +一段时间跨度+since+一般过去时的句子”才出现since。没有以上句子结构,就不能用。第二句中的It‘s=It have。