Requests for paternity tests(亲子鉴定) by Chinese men ______ (increase) in recent years.

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问题 Requests for paternity tests(亲子鉴定) by Chinese men ______ (increase) in recent years.

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答案have increased

解析 动词时态。根据时间状语in recent years(通常用于完成时态),此处需用现在完成时。[例句] In recent years,oil has substituted for certain natural materials.近年来石油已取代了某些天然材料。
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