当回答是A key and a notebook.时,该问What ’s in the bag?还是What are in the bag?Why?
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当回答是A key and a notebook.时,该问What ’s in the bag?还是What are in the bag?Why?
是What are in the bag?
因为根据回答可知书包里不知一种东西在里面
What ’s in the bag?