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Judging from his face_______ there was a confident smile, we knew that he didn’t lose heart.
A、in which
B、from which
C、by which
D、on which
【正确答案】：D
【题目解析】：考查定语从句介词+关系代词的用法。a confident smile on his face.句意为：从他脸上自信的笑容来判断，我们知道他没灰心。故选D。