By 5 o'clock,he __(work)in the field for 6 hours.

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By 5 o'clock,he __(work)in the field for 6 hours.
By 5 o'clock,he __(work)in the field for 6 hours.

By 5 o'clock,he __(work)in the field for 6 hours.
had been working
一直在工作

had worked