问题补充：
This kind of books well and they out last week.
A. sells; were sold
B. is sold; sold
C. sells; sold
D. is sold; were sold
答案：
(答案→)A. sells; were sold
B. is sold; sold
C. sells; sold
D. is sold; were sold
解析：sell本身没有被动语态，而sell out则相当于及物动词，有被动语态，故选A
