Nowadaysmanyteenagersoftentaketheirparents’loveforgrant...

问题详情：

Nowadays many teenagers often take their parents’ love for granted. Seldom 　　　　　________ what they should return them when they are old.    

A. do they think           B．they think　       C．think they             D．did they

【回答】

A

知识点：倒装与省略

题型：选择题