They will fly to Shanghai they plan to stay for two days.A. whenB. whichC. whereD. why

问题补充：

They will fly to Shanghai, they plan to stay for two days.

A. when

B. which

C. where

D. why

答案：

A. when

B. which

(答案→)C. where

D. why

解析：考查定语从句。本题的先行词是Shanghai，定语从句中的句子结构很完整就使用关系副词。句意：他们讲飞往上海，在那里他们计划待两天。故C正确。