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【题目】我一直想掌握天文学方面的知识。

【答案】I've been trying to get the hang of the knowledge of astronomy.
【解析】try to do固定短语,“努力做,尽力做”;get the hang of固定短语,“掌握”;the knowledge of astronomy“天文学方面的知识”,根据句意,句子是现在完成进行时,因此答案为I've been trying to get the hang of the knowledge of astronomy.

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