while 可以与表示状态的动词过去式连用；
这里的 was left along at his desk (= 被单独留在桌边) 是一种状态；
worked (= 工作)是一个表示延续性动作的动词,这里不用进行时是可以的.
while后可加动词过去式吗,例如：I was left alone at his desk while he work
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