This summer several provinces in the south of China was struck by floods from effects th

问题补充：

This summer, several provinces in the south of China was struck by floods, from effects the people are still suffering.

A. what

B. which

C. whose

D. that

答案：

A. what

B. which

(答案→)C. whose

D. that

解析：考查非限制性定语从句。句意“今夏，中国南部几省发生涝灾，人们还在遭受洪水的影响。”句中有逗号，是非限制性定语从句，suffer from“遭受......”。what不用于定语从句；which作主语或宾语；whose作定语，意为“谁的”；that作主语或宾语。故选C。