23. After working until midnight for two weeks, he finally_________and had to stay in the hospital.

A．broke up

B．gave in

C．broke down

D．gave up

对于减压渣油，目前一般还是用溶剂处理及液相色谱法将其分成饱和烃、芳香烃、胶质和沥青质四个组分。