Researchers all over the world have been seeking for determining how early infancy conceptual thinking is possible.

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问题 Researchers all over the world have been seeking for determining how early infancy conceptual thinking is possible.

选项 A、have been seeking about determining
B、have been seeking to determine about
C、have been seeking to determine
D、have sought to determine

答案C

解析时态应用及结构应用本句意为：世界各地的研究人员都试图确定幼年的概念思维始于何时。因为这一研究始于过去，且仍在延续，所以用过去完成进行时；seek for／after搜寻，寻找，追求；seek to do尝试……，试图……；所以答案为C。

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