is known to us all is that the 2012 Olympic Games will take place in London.
A．ItB．WhatC．AsD．Which
B

試題分析：通過分析句子結(jié)構(gòu)，可知這個句子中包含一個主語從句和一個表語從句。引導(dǎo)詞在主語從句中作主語，且表示什么的含義，故用What。
點評：在句子中起主語作用的從句叫做主語從句。解答這類題，首先要確定從句是什么從句，然后依據(jù)相應(yīng)的語法規(guī)則答題。主語從句中引導(dǎo)詞的確定，要看它在主語從句中作什么成分，有沒有什么實際意義。
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