Several weeks had gone by I realized the painting was missing.

Several weeks had gone by I realized the painting was missing.

题目
Several weeks had gone by I realized the painting was missing.
答案
很明显,前面半句是过去完成时,表示过去的过去,后面半句是过去时.因此前面的动作发生在后面的之前
所以要用before,而不能用since,就是这个道理
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英语翻译
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