解析 A。本题考查现在完成时。“so far”是现在完成时的标志,用“has faced”,表示到目前为止,关于区块链技术的研究已经面临了许多挑战。选项 B“faced”是一般过去时,不能体现到现在的情况。选项 C“faces”是一般现在时,不符合时间状语。选项 D“had faced”是过去完成时,不符合语境。
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