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1.A:The food must be good.B:No,it______be good.

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1.A:The food must be good.B:No,it______be good.
A must not B needn't C wouldn't D cannot
2.I am afraid I_____go with you.I am very busy these days.
A mayn't B can't Cam not able to D mustn't
3.The soldiers looked everywhere for the spy,but they _____find him.
A can't B couldn't C is not able to D was not able to
为什么,
1.A:The food must be good.B:No,it______be good.
1.A:The food must be good.B:No,it______be good.
A must not B needn't C wouldn't D cannot
c cannot 是单纯表示主观上认为不可能,而 wouldn't则有从客观角度,有原因的(如时间太长)的不可能
2.I am afraid I_____go with you.I am very busy these days.
A mayn't B can't Cam not able to D mustn't
B 选can't最主要是是最常用的,日常生活用于都是这么用的
3.The soldiers looked everywhere for the spy,but they _____find him.
A can't B couldn't C is not able to D was not able to
B 过去式,只能用couldn't啊,were not able to才符合语法.