The boss insisted that the task before 5 o’clock this afternoon.A. was finishedB. finished

问题补充：

The boss insisted that the task before 5 o’clock this afternoon.

A. was finished

B. finished

C. be finished

D. should finish

答案：

A. was finished

B. finished

(答案→)C. be finished

D. should finish

解析：考查insist用法。当insist表示坚持要求做某事的时候，后面的宾语从句使用（should）+动词原形；当insist表示坚持认为的时候，后面使用陈述语气；句意：老板坚持要求在具体下午5点之前完成这个任务。根据句意说明本题的insist表示坚持要求做某事，所以使用should+动词原形的虚拟语气，should可以省略。故C正确。