She can't have been Danish. and She must have been Swedish.

She can't have been Danish. and She must have been Swedish.
She can't have been Danish. and She must have been Swedish.

She can't have been Danish. and She must have been Swedish.
She can't have been Danish.and She must have been Swedish
Danish,Swedish是形容词表人或语言.而不能表国家
【她不会曾是丹麦人,她肯定曾是瑞典人】
【她以前不会是丹麦人,她以前肯定是瑞典人】
丹麦:Denmark
瑞典:Sweden

她绝不可能到过丹麦，她一定瑞典呆过。

她不可能到过丹麦。她一定去过瑞典。

她没去丹麦必去瑞典 逻辑？

她不可能曾是丹麦人，不过可以肯定的是她曾去过瑞典。

她从来没有去过丹麦，但她一定去过瑞典呆。

她不可能曾经是丹麦人，她一定是瑞典人。