The old man was quite weak after the accident. So he _____. [ ]

A. must be take care of

B. must take care of

C. must be looked after

D. must look after

最易造成湿热下注型经断复来的病因是（）

A．忧郁过度 

B．多产房劳 

C．素体虚弱 

D．经期不洁，感受外邪 

E．久病伤阴