问题补充:
I insisted that a doctor immediately.
A. has been sent for
B. sends for
C. will be sent for
D. be sent for
答案:
A. has been sent for
B. sends for
C. will be sent for
(答案→)D. be sent for
解析:句意:我坚持要求立即找医生。通过分析句子结构,可知这个句子包含一个宾语从句。在表示建议、要求、命令的动词后的宾语从句中,要用should+动词原形,should可以被省略,选D。