Seeing a large crowd at the street corner，I became aware of unusual happening．A.anythingB.somethingC.everythingD.nothing
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B解析试题分析：考查不定代词：A．anything任何事，B．something某些事C．everything任何事D．nothing没有事情，拐角，我意识到不寻常的事情发生了。选B。考点：考查不定代词
点评：不定代词的考查看句式：something用于肯定句，anything用于否定句，nothing是完全否定，everything和not连用是部分否定。