答案为【through】
这里关健得注意定语从句中的study the skies 和先行词a telescope 之间的意思联系, 应该是【透过望远镜】观望太空. 明白? 所以不能是by 而是through
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He built a telescope ________ which he could study the skies 为什么不能用by
He built a telescope ________ which he could study the skies 为什么不能用by
英语人气：965 ℃时间：2019-11-01 19:42:44
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