Mr. Wang told us that he would devote all the time he could spend _______ his oral English before going abroad.

A．improve

B．to improve

C．improving

D．to improving

26岁，初产妇，身高160cm，39周妊娠。估计胎儿体重3300g，规律宫缩12h。 * * 检查：宫口开大5cm已1h，先露0，大囟在3点，小囟在9点，矢状缝向后靠近骶岬，盆腔后部空虚。正确的处理是()

A．即刻剖宫产

B．地西泮10mg静推

C．利多卡因宫颈封闭

D．静滴催产素加强宫缩

E．徒手将胎头旋转至枕前位