______math books.They're____ books A、Their;they______math books.They're____ booksA、Their;theyB、Ther're; theirC、Them; theirD、They;them's

问题描述:

______math books.They're____ books A、Their;they
______math books.They're____ books
A、Their;they
B、Ther're; their
C、Them; their
D、They;them's

b