The teacher bought many books for her students, which 500.
A. added
B. added to
C. added up
D. added up to
网友回答
A. added
B. added to
C. added up
(答案→)D. added up to
解析：考察动词add的短语。固定搭配add to增加；add up共计，加起来；add up to共计达…；add增加，补充；句意：老师给她的学生买了很多书，共计达500元。攻击句意说明D正确。