高考英语,一道单选(句子分析)
SchoolacrossChinaareexpectdetoheir50,000collegegraduatesthisyearasshort-termteachers,almostthreetimesthenumberhiredlastyear,tohelpreduceunemploymentpressures.
请问tohelpreduceunemploymentpressures在句中作什么成分?
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