From birth,nightjar chicks solicit food by walking to the front of an adult bird,reaching up,and（）.A、they peck at its billB、peck at its billC、pecking at its billD、at its bill they peck-易过题库-题库最全的搜题网站

From birth,nightjar chicks solicit food by walking to the front of an adult bird,reaching up,and（）.

Athey peck at its bill

Bpeck at its bill

Cpecking at its bill

Dat its bill they peck

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