He had been doing his homework for hours when I called him yesterday evening.
做完我给他打电话时，他一直在做作业，已有好几个小时了。
I was about to leave for work, when you called me.
你给我打电话的时候，我正要去上班呢。
But when I called for still more, they showed me that they had no more.
但是当我再要求时，他们表示没有了。
But when I called for still more, they showed me that they had no more.
但是当我再要求时，他们表示没有了。
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