I often see her _______ the piano. Listen, can you hear her _________ the piano now?

A．play, playing

B．plays, playing

C．playing, plays

D．play, plays

下列防范措施中，( )不是质量纠纷的防范措施。

A．完善质量保修制度

B．严格按照建设程序进行工程建设

C．按照法律、行政法规和建筑工程质量安全标准的要求进行设计和施工

D．避免合同总价与分项工程单价之和不符