Only after you finish your work _____ TV. [ ]

A. you are allowed to watch

B. are you allowed watching

C. are you allowed to watch

D. can you be able to watch

合同的变更是指合同依法成立后，在尚未履行或未完全履行时，当事人双方依法经过协商对合同的( )进行修订或调整所达成的协议。

A．形式

B．内容

C．主体

D．客体