GWD-9-19 虚拟语气

In many nations, criminal law does not apply to corporations, but in the United States today, a corporation commits a crime whenever one of its employees commits a crime, if the employee acted within the scope of his or her authority and if the corporation benefited as a reult.

这是正确答案.

想问, 为什么主句是真实的语态, 而从句却又虚拟语气呢?