--- You look very tired. _____ at all last night?

--- No, not really. I’m tired out now.

A．Do you sleep

B．Were you sleeping

C．Did you sleep

D．Had you slept

下列关于中期妊娠水囊引产错误的是（）

A.机械刺激促进前列腺素合成与释放

B.禁用于瘢痕子宫

C.适用于利凡诺引产禁忌证

D.感染率较其他方法高

E.应被广泛应用