-When did the couple die?-- It was on May 12 the earthquake hit Wenchuan County.A.

问题补充：

---- When did the couple die?

---- It was on May 12 the earthquake hit Wenchuan County.

A. that

B. which

C. when

D. what

答案：

(答案→)A. that

B. which

C. when

D. what

解析：本题考查强调句。强调句结构：it is/was … that …,强调时间状语on May 12，故选A。