问题描述：
mustn't和can't
Susan ____ be here now because she has just gone to NewYork.
应该填mustn't还是can't?详细的分析..
Susan ____ be here now because she has just gone to NewYork.
应该填mustn't还是can't?详细的分析..
问题解答：
我来补答展开全文阅读