Yunnan province in China was attacked by such a terrible drought this early spring few peo

问题补充：

Yunnan province in China was attacked by such a terrible drought this early spring few people had experienced before, made us worry about global climate changes.

A. that; that

B. as; which

C. which; it

D. when; as

答案：

A. that; that

(答案→)B. as; which

C. which; it

D. when; as

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