妊娠高血压综合征发生时间多在( )
A．妊娠前B．妊娠20周后C．妊娠24周后D．妊娠28周后E．分娩期
参考答案：B
It was great fun _____ a picnic on the hill.
A．to have
B．of having
C．have
D．had
流感嗜血杆菌引起的化脑可选用___________________，耐药者可用___________________或___________________。
