I was on the highway when his car went past, followed by a police car. They _____ at least 150km

an hour.[ ]

A. should have been doing

B. would have done

C. could have done

D. must have been doing

IVIG治疗新生儿溶血性黄疸的主要作用（）

A.减少胆红素产生

B.促进胆红素运输

C.加强肝脏代谢

D.减少肠肝循环

E.促进胆红素排泄