The secretary worked all night long, ______ a long speech for the president.

 [      ]

A. to prepare

B. preparing

C. prepared

D. was preparing

礼貌待人是一种美德。下列有关礼貌的说法，不正确的是[     ]

A．礼貌是尊重的具体表现

B．礼貌是处理人与人之间关系的一种规范

C．是否礼貌待人不能影响到人际关系的好坏

D．语言文明、态度亲和、举止端庄是与人友好交往的必备素养