产科最严重的并发症是

A．产后出血

B．胎膜早破

C．子宫破裂

D．脐带脱垂

E．羊水栓塞

—— I didn’t see her yesterday.

—— Oh, but you ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿.

A．must have

B．ought to

C．should have

D．cannot have