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

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：

A. that

B. which

(答案→)C. when

D. what

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