I supported him in time , otherwise he            off the bike .

A．might fall

B．would fall

C．would have fallen

D．should have fallen

设计与施工分离，施工单位“按图施工”，基本上处于被动地位，在一定程度上影响其( )的发挥。

A．唯一性
B．动态性
C．积极性
D．及时性