______Math book,they'er_____books.A.Their;

问题描述:

______Math book,they'er_____books.A.Their;
______Math book,they'er_____books.A.Their;they B.They're;their C.Them;their D.They;them's

B
第一个空是他们是..第二个是他们的(用物主代词)哦谢谢