—Is your father a teacher?

—Well, he _______. [ ]

A. used to

B. was used to

C. used to be

D. is used to be

广东省东风进出口公司(GUANGDONG DONGFENG IMPORT AND EXPORT CORP. 122 DONG FENG ROAD EAST, GUANGZHOU. )与SANYEI HONG KONG 14/F., KAISER ESTATE 1, MAN YUE STREET, HUNG HOM, SYDNEY, AUSTRALIA达成一笔交易。内容主要有：2 400件不锈钢铲头(STAINLESS STEEL SPADE HEAD)，每12件扎成1捆，2002年12月1日出运。该公司填制好如下“FORM A”，请审核并修改。