The speaker ______ have criticized the paraprofessionals, knowing full well that they were seated in the audience.

A．should not to

B．must not

C．ought not to

D．may not

关系数据库中，表与表之间的联系是通过 ______ 来实现的。

A．实体完整性规则

B．参照完整性规则

C．用户自定义的完整性

D．值域