the farmers began to work in the fields _____dawn (in ,on,at,until)

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the farmers began to work in the fields _____dawn (in ,on,at,until)
the farmers began to work in the fields _____dawn (in ,on,at,until)

the farmers began to work in the fields _____dawn (in ,on,at,until)
at,这是固定短语,at dawn在黎明