---We haven’t been to Hangzhou for ages. 

---No, I don’t remember how many years ago _______ I last visited it. 

A．it was that

B．was it that

C．it was when

D．was it when

关于胎膜早破，下列正确的是（）

A. * * 液涂片用苏丹染色见橘黄色脂肪小粒可确定为羊水

B. * * 液pH≥6.5时可考虑胎膜早破

C.孕期达35周以上胎膜早破者，可令其自然分娩

D.若羊水池深度≤5个单位可采用羊水输注法注入羊水

E.足月破膜＞24小时未临产者予催产素引产