Question

—What are those?
—         are their books．
A．That                B．They’re               C．They

Answer 1

C

由題目中的What are those?可知是復(fù)數(shù)概念，that表示單數(shù)，故A錯(cuò)。回答中有個(gè)are，B中They’re就重復(fù)了，故B錯(cuò)，選C。