单选题：He now regrets__________ harder when he was at sch001．

题目内容：

He now regrets__________ harder when he was at sch001． A．not to study
B．not studying
C．having not studied
D．not to be studying

参考答案：【答案仅供学习，请勿对照自行用药等】

答案解析：

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Which of the following helped to preserve“Lindow Man”?A．Ice and low temperature．

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