问题补充：
The old worker insisted that he old, and back to the working post again.
A. wasn’t; were sent
B. be not; send
C. wasn’t; be sent
D. isn’t; sent
答案：
A. wasn’t; were sent
B. be not; send
(答案→)C. wasn’t; be sent
D. isn’t; sent
解析：考查虚拟语气。句意：这位老工人坚持说他不老，坚持要求重新回到工作岗位。insist有两层含义，当它作“坚持要求，”讲时要用虚拟语气,从句用should+动词原形,should可以省略。而作“坚持说，坚持认为”讲时不用虚拟语气。故第一空不用虚拟语气，根据动词insisted提示可知应填was’t,第二空则要用虚拟语气，he 与sent之间为被动关系，故用被动语态should be sent ,should 可省略。故选答案C。
