约翰坐在那里咬指甲时，我正在制定一个回家的计划。
While John was sitting biting his nails, I was working out a plan to get us home.
当你回家时，约翰将会是正在读英语。
约翰坐在那里咬指甲时，我想出了一个回家的办法。
While John was sitting biting his nails, I was working out a plan to get us home.
约翰坐在那里咬指甲时，我想出了一个回家的办法。
While John was sitting biting his nails, I was working out a plan to get us home.
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