It was my sister ________ first had the idea to cycle along the entire Mekong River.

A．who

B．whom

C．/

D．which

因不可抗力导致监理单位现场的物质损失和人员伤害，由（）负责。

A.建设单位，

B.施工单位，

C.监理单位，

D.政府部门，