He insisted that the doctor at once.A. be sent forB. was sent forC. was going to be sent f

问题补充：

He insisted that the doctor at once.

A. be sent for

B. was sent for

C. was going to be sent for

D. must be sent for

答案：

(答案→)A. be sent for

B. was sent for

C. was going to be sent for

D. must be sent for

解析：考查insist用于虚拟语气的用法：insist表示坚持要求的时候，后面从句接虚拟语气：（should） do，但是如果是表示坚持说，就不用虚拟语气，而是陈述语气，句意：他坚持要求派人请医生。因为the doctor和send for是被动关系，用be sent for，省略了should。