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China's population is expected to increase to about 1.5 billion in 2040, ______it will start to decline slowly.

A. where B. which C. on which D. after which

 

D

【解析】

試題分析:考查非限制性定語從句。句中有逗號,說明是非限制性定語從句,先行詞是2040,指時間,排除A;on when相當于when,但on指具體的一天,這里的2040年是一段時間,排除C;which作主語或賓語,it will start to decline slowly不缺少成分,排除B,after which相當于after 2040,故選D。

考點:考查非限制性定語從句

 

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