His grandparents used to ________ a walk after dinner, but now they are used to ________ a walk after breakfast.

A．take, take

B．taking, taking

C．taking, take

D．take, taking

胎盘附着面复旧不全和胎盘附着面血栓脱落是晚期产后出血常见原因，下列叙述不恰当的是（）

A.多发生在产后1周左右

B.出血时间不一

C.可以延缓至产后2个月

D.出血多少与胎盘附着面大小有关

E.与产褥感染互为因果关系