_____ is known to us is that the 2012 Olympic Games will take place in London．
A．ItB．WhichC．AsD．What.
D

試題分析：考查主語從句：分析句子成分可知第二個is是主句的謂語，前面都是主語從句，而主語從句缺少主語，填what，句意是：我們都知道的是2012年奧運會將在倫敦舉行。選D。
點評：what引導名詞性從句時，要在主語從句中做主語，賓語和表語，如果名詞性從句不缺成分，一般用that引導。
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