问题描述：
英语翻译
Thanks to the golden timing then,he had hardly got familiar with the dealings in the field (37)_____ he enjoyed great success.His wealth rose rapidly and before long he became a millionaire.
37.when
Thanks to the golden timing then,he had hardly got familiar with the dealings in the field (37)_____ he enjoyed great success.His wealth rose rapidly and before long he became a millionaire.
37.when
问题解答：
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