【題目】how long, have, from, you, been, Beijing, back（你從北京回來多久了？）

____________________

【答案】How long have you been back from Beijing?

【解析】

how long多長時間，用來提問一段時間；have有，或者現(xiàn)在完成時的助動詞；from從……；you你，人稱代詞；been是be動詞的過去分詞；Beijing北京；back回來；再由句意提示可知，這里應該用現(xiàn)在完成時，構成have been的結構，句子是一個特殊疑問句，所以應該以How long開頭，后接一般疑問句語序，把have提到主語you前面，故答案為How long have you been back from Beijing?

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