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

分类: 作业答案 • 2022-01-09 18:04:09

问题描述：

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

答

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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