-Have some more cakes.-Oh,I--- ,thank youA.may notB.mustn'tC.shouldn'tD.couldn't选什么还有为什么?

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-Have some more cakes.-Oh,I--- ,thank youA.may notB.mustn'tC.shouldn'tD.couldn't选什么还有为什么?

-Have some more cakes.-Oh,I--- ,thank youA.may notB.mustn'tC.shouldn'tD.couldn't选什么还有为什么?
-Have some more cakes.-Oh,I--- ,thank you
A.may not
B.mustn't
C.shouldn't
D.couldn't
选什么还有为什么?

-Have some more cakes.-Oh,I--- ,thank youA.may notB.mustn'tC.shouldn'tD.couldn't选什么还有为什么?
选D.从语境分析应该是一个人叫另一个人再吃些蛋糕,再看选项,我们可以知道另一个人想说的是“谢谢!我已经够了."现在看A选项意思是”也许不“,带入肯定不符合我们的说话规矩.B选项为mustn't,must是必须的意思,但与not连在一起却表示禁止的意思,如You mustn't play on the road!(禁止在马路上玩耍!)所以也不对.C表示不应该,明显不对.D表面一般意思为”不能够“,带入句子”Oh,I couldn't,thank you"其实这句话是省略句,完整的应该是“Oh,I couldn't(have/eat any more cakes),thank you

couldn't
哦,我吃不下了.谢谢.