The boy could earn a little money by (deliver) ______ newspapers.

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问题 The boy could earn a little money by (deliver) ______ newspapers.

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答案delivering

解析 所填之词跟在介词by的后面,因此只能用动名词或名词形式。又因by后还要接宾语,这里应用deliver的动名词形式delivering,意为“递送”。
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