I lost a set of keys.然后是用 Is this yours?还是Are these yours?
问题描述:
I lost a set of keys.然后是用 Is this yours?还是Are these yours?
答
Is this yours?a set of keys要看成整体,是一个单数.
I lost a set of keys.然后是用 Is this yours?还是Are these yours?
Is this yours?a set of keys要看成整体,是一个单数.