I can never forget the day _______ we worked together and the day ______ we spent together.

A．when; which

B．which; when

C．what; that

D．on which; when

科学立法的核心在于尊重和体现（），民主立法的核心在于为了人民、依靠人民。

A、客观实际

B、客观世界

C、客观规律

D、自然规律