It was July 24th when he arrived in London the 30th Olympic Games would be declared open

问题补充：

It was July 24th when he arrived in London, the 30th Olympic Games would be declared open 3 days later.

A. that

B. how

C. where

D. Who

答案：

A. that

B. how

(答案→)C. where

D. Who

解析：考查定语从句。本题的先行词是London，定语从句中的结构很完整，所以使用关系副词。因为先行词是指地点的名词，故使用where。故C正确。