It is said that many kids are worried about the year they think the earth will be de

问题补充：

It is said that many kids are worried about the year , they think the earth will be destroyed by disasters.

A. when

B. where

C. as

D. which

答案：

(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，他们认为地球将会被摧毁。”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；是时间，故用when。故选A。