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From birth,nightjar chicks solicit food by walking to the front of an adult bird,reaching up,and（ ）.
A.they peck at its bill
B.peck at its bill
C.pecking at its bill
D.at its bill they peck
B.peck at its bill
C.pecking at its bill
D.at its bill they peck
参考答案
参考解析
解析：该题考查平行或一致关系。连词and前是reaching up，因此答案为C，其中“reaching up，and pecking at its bill”是分词短语做状语表示伴随。
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材料题
C
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