_________has been announced,the competition will be held in Zhengzhou in 2007.A、 ThatB、 AsC、 ItD、 What请说明理由.

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_________has been announced,the competition will be held in Zhengzhou in 2007.A、 ThatB、 AsC、 ItD、 What请说明理由.

_________has been announced,the competition will be held in Zhengzhou in 2007.A、 ThatB、 AsC、 ItD、 What请说明理由.
_________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.

_________has been announced,the competition will be held in Zhengzhou in 2007.A、 ThatB、 AsC、 ItD、 What请说明理由.
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.

B

c

B
(It has been announced that the competition...)
what引导主语从句的话需要谓语动词,中间不应有逗号。
而as可以代替后面的一整句话,做主语。