So sudden ________ that the enemy had no time to escape.[ ]

A. did the attack

B. the attack did

C. was the attack

D. the attack was

柯明是一家公司的总经理，他想确认一下自己的内部客户和外部客户，属于他的外部客户的是（）。

A、下属

B、其他部门经理

C、上级领导

D、供销商