由于目标、任务的需要，通过上级组织或职能部门决定成立并组建的群体是（）。
A、小型群体
B、松散群体
C、正式群体
D、参照群体
参考答案：C
During the reconstruction of the city , many modern tall building went up old shabby houses were torn down.
A．in what
B．where
C．in which
D．which
