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【单选题】
既有 σ - π 超共轭效应又有 π - π 共轭效应的醛、酮分子是A.
C6H5CH＝CHCHO
B.
CH2＝CHCOCH3
C.
CH3COCH2CH3
D.
CH2＝CHCH2CHO
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反馈参考答案：
举一反三
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A.
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B.
I’m in Class One
C.
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D.
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A.
had to return to the train station after leaving the stranger at the tavern
B.
was going home after leaving the stranger at the tavern
C.
lived at the tavern
D.
was going away on the train
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