认为人的态度同其他习惯一样是通过后天习得的，这属于：（）
A.学习论
B.诱因论
C.认知相符论
D.自我知觉理论
参考答案：A
They studied what ______ since 2007 and found Australian electricity prices were among the highest in the developed world.
A．has happened
B．happened
C．had happened
D．has been happening
十二辰俑
