注意：此页面搜索的是所有试题
题目内容
（兰州理工大学-软件技术-大学英语1）
Prior to��������������� the formal speech, first he will introduce himself.
A．delivering
B．deliver
C．being delivering
D．being delivered
A．delivering
B．deliver
C．being delivering
D．being delivered
参考答案