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Do you have to write to your friend?-Sorry,but I really ____

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Do you have to write to your friend?-Sorry,but I really ______. A.can't B.must C.have D.should
D
你必须要给你朋友写信吗?
对不起,但我真得应该写
回答是:对不起,说明是否定的意思,也就是说不是必须写.所以不能选B.
A和C的选项意思根本不符.
只有选D.Sorry but I really should.对不起,但是我应该写.
再问: You must be here at 5:30 tomorrow moring.-Sorry,I____ be here so early. A.needn't B.mustn't C.can't D.may not
再答: C 对不起,我到不了这么早 上一题给你说错了,应该是D,上面有解释 ~~~~~~~~~~~~~~~~祝你进步,如对你有帮助,请及时采纳~~~~~~~~~~~~~~~~