The professor found himself constantly________the question:How could anyone do these things?

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问题 The professor found himself constantly________the question:How could anyone do these things?

选项 A、presiding
B、poring
C、pondering
D、presuming

答案C

解析 ponder考虑，默想，思考。preside主持，指挥。pore细想，熟读，凝视。presume假定，敢于。

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