There are some health problems that, when ___in time, can become bagger ones later on.

A．not treated

B．not being treated

C．not to be treated

D．not having been treated

孕足月，临产4小时突然破水，羊水Ⅲ度，因胎儿宫内窘迫行剖宫产术，术中胎儿娩出后，产妇突然呼吸困难，烦躁不安，发绀，血压70／50mm／Hg，呼吸50次／分，双肺底有湿啰音。

预防本病应注意以下哪项（）

A.宫缩过强时，应给抑制宫缩药物

B.注意缩宫素的使用剂量及适应证

C.避免宫缩时破膜

D.防止宫颈裂伤

E.以上都是