隐含价格法的应用表述正确的是( )。

A．房地产价格在市场中自由形成
B．房地产价格在市场中人为形成
C．房地产价格在市场中由房地产商决定
D．房地产价格在市场中由国家相关部门决定

None of them knew what had happened _________ I told them about it.    

A．when

B．until

C．after

D．though