The boy finally was beginning ___ his mistakes.

A．that he saw

B．for him to see

C．seeing

D．to see

目前，世界上各证券交易所的订单匹配原则普遍使用（）原则作为第一优先原则。

A.时间优先

B.价格优先

C.客户优先

D.数量优先