---We’d like a standard room, please.

---I’m sorry. All but two single rooms with Internet access        .

A．were reserved

B．has been reserved

C．have been reserved

D．has reserved

开始保护会阴的时机应在

A．宫口开全时
B．胎头开始拨露时
C．胎头着冠时
D．胎头拨露阴唇后联合紧张时
E．胎头复位后两肩开始娩出时