产后2周，突然大量 * * 流血，检查子宫大而软，宫口松，有血块填塞，最可能的原因是（）。

A.子宫内膜息肉

B.子宫浆膜下肌瘤

C.子宫胎盘附着面感染

D.蜕膜残留

E.子宫颈炎

Doctors strongly recommended that my father _____ more exercise regularly instead of sitting still before a computer all day long.

A．takes

B．take

C．took

D．had taken