问题补充:
Not a single book is allowed out of the reading room according to the new rule.
A. to take
B. taking
C. to be taken
D. being taken
答案:
A. to take
B. taking
(答案→)C. to be taken
D. being taken
解析:固定结构。allow sb to do sth允许某人做某事;本句是被动语态。句意:根据新规则任何一本书都不能被带出阅览室。