It was silly ____ you to give up ____ things that we all wanted.

A．for, to do

B．for, doing

C．of, to do

D．of, doing

研究表明天气和心情之间存在着下列哪种关系？（）

A.适度正相关

B.适度负相关

C.强的正相关

D.强的负相关

E.天气往往很少影响到情绪