The students gave a quick answer to the question they did it was raised by the foreign vis

问题补充：

The students gave a quick answer to the question they did it,was raised by the foreign visitors.

A. which;which

B. why;which

C. why;that

D. that;that

答案：

A. which;which

(答案→)B. why;which

C. why;that

D. that;that

解析：第一个从句是同位语从句，应用 why引导，因为why从句是说明 question的内容的。第二个空选用which的主要原因是这是一个非限定性定语从句。