All the doctors in the hospital insisted that he ____ badly wounded and that he _____ at once. [ ]

A. should be; be operated on

B. were; must be operated on

C. be; was operated on

D. was; be operated on

移动交换中心地网的接地电阻值不应大于（）欧姆。

A.0.1

B.0.5

C.1

D.5