以行贿论处（）

A．在账外暗中给予对方单位或者个人回扣的

B．对方单位或者个人在暗中收受回扣的

C．以明示方式给予对方折扣的

D．以明示方式给中间人佣金的

E．接受佣金如实人账的

The government of the United States began at once to investigate the case ______ a lot of students were killed.

A．that

B．when

C．where

D．why