Not a single book is allowed out of the reading room according to the new rule.A. to take

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。