Nancys gone to work but her cars still there. She_____by bus.(2010)A.must have goneB.shoul

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Nancys gone to work but her cars still there. She_____by bus.(2010)

A.must have gone

B.should have gone

C.ought have gone

D.could have gone

请帮忙给出正确答案和分析,谢谢!

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