Science has given clear evidence smoking can lead to many diseases.A. whatB. whichC. that

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A. what
B. which
(答案→)C. that
D. where
解析：
试题分析:考查同位语从句。分析句子可知evidence后面从句是解释说明evidence内容的同位语从句，从句结构完整不缺少成分，所以用that引导。正确答案选C。句意：科学已经给出明确的证据，吸烟能够导致很多种疾病。