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____ is known to us all is that the 2008 Olympic Games will take place in Beijing.

A．What B． It C．As D．Which

A

解析試題分析：句意：眾所周知，2008 年奧運(yùn)會(huì)將在北京舉行。It做形式主語。后面的that從句是真正的主語。
考點(diǎn): 考查主語從句的關(guān)系詞辨析。

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