I insisted that a doctor immediately.A. has been sent for B. sends forC. will be sent for

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。