宽带固定无线接入技术主要()、()和()3类。
参考答案:多路多点分配业务(MMDS);直播卫星系统(DBS);本地多点分配业务(LMDS)
______ the day going on, the weather got worse.
A.As
B.Since
C.With
D.While
----Have you seen Mr. Black these days, Jack?
----Yes, I met him when I ________ in the street yesterday.
A.walked
B.was walking
C.have walked
D.is walking