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

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. where

B. as

C. when

D. which

答案：

A. where

B. as

C. when

D. which

解析：考察定语从句。先行词为 the year ,when 在从句中做状语