单选题
______ several hypotheses have been advanced for the disappearance of the dinosaur, no conclusive evidence supports any of them.
【正确答案】
C
【答案解析】[解析] although是连词，引导让步状语从句。despite和in spite of为介词和介词短语，不能接句子。in spite of the fact后如果接同位语从句必须有that，不能省略。