Youcan’timaginehowpopularthewriter’snewbooksare.They

问题详情：

You can’t imagine how popular the writer’s new books are. They __________ as soon as they “appeared” in front of the public.

        A. sold out     B. were sold out     C. checked out     D. were  checked out

【回答】

B

知识点：动词语态

题型：选择题