It is said that many kids are worried about the year 2012, they think the earth will be destroyed by disasters.
A. when
B. where
C. as
D. which
网友回答
(答案→)A. when
B. where
C. as
D. which
解析：考查非限制性定语从句。句意“据说有很多孩子都在担心2012，他们认为2012年地球将会被摧毁。”本句是非限制性定语从句，“they think...”从句不缺少成分，故不用C、D；2012是时间，故用when。故选A。