核心问题
I insist that a doctor ____ immediately. A. has been sent for B. sends for C. will be sent for D. be sent for(上海高考) 答案为 D。但是至今我也没有把它的意思和结构弄清楚。
词典解答
首先要知道，在 insist 的宾语从句中要使用现在虚拟式，见 request，insist。其次要明白 send for 的意思是“派人去请”“（写信、打电话）请来”“派人去取”：
-
The baby is ill; we ought to send for the doctor. 婴儿病了,我们得去请医生来。
-
She sent for a doctor. (JEFC, 3, p. 43) 她派人去请医生。
We have sent for a doctor. 的被动形式是: A doctor has been sent for (by us). (我们已派人去请医生。) 上题中 be sent for 便是被动形式。其陈述语气为: A doctor is sent for.
练习题
请做下面的英语试题：
—Will somebody go and get Dr. White? —He's already been ____.
A. asked for B. sent for C. called for D. looked for(全国高考,91-21)