_________has been announced,the competition will be held in Zheng_英语解答

_________has been announced,the competition will be held in Zhengzhou in 2007.
A、 That
B、 As
C、 It
D、 What
请说明理由.

人气：156 ℃　时间：2020-04-28 07:45:40

解答

B!相等于which,是定语从句,放在句首用as.
如果选A,C,逗号处必须换成that.
D就更不对了.