______ it is possible that genes have some influence I find it hard to believe that they
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______ it is possible that genes have some influence, I find it hard to believe that they would count for more than all the thousands of experiences each person has.
A．Because
B．Since
C．For
D．Whilst
请帮忙给出正确答案和分析，谢谢！
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正确答案：D
关系词题。whilst相当于while，可引导让步状语从句，表示“尽管，虽然”，符合句意。而because，since，for均为表示原因的连词，可以一起排除。