Mary had finished her homework ___the time i got home.A.until B.by C.at D.when

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• 高中英语单选题 急8. The mother asked her son _______. A. what did he do the day before B. where did he find his lost walletC. what time he got up that morning D. that if he had finished his homework9. He asked me _______ I would go to Beijing by air the next day.A. that if B. if C. that whether D. how正确答案及详细解释
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• Mary had finished her homework ___the time i got home.A.until B.by C.at D.when
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• Mary had finished her homework ____ the time I got home.A.until B.by C.at D.when
• Mary had finished her homework ____ the time I got home.
• Mary had finished her homework ___the time i got home.A.until B.by C.at D.when
• Mary had finished her homework ____ the time I got home.
• 已知函数f(x)=2根号3sinxcosx+cosx的平方-sinx的平方求在△ABC中,角A,B,C对应边为a,b,c,若f(A)=1,a=2根号7,b=4,求c的值及△ABC的面积