问题标题：
OG12thGMAT句子分析上题in1995Richard.Stallman,awell-knowcriticofthepatentsystem,testifiedinPatentOfficehearingsthat,totestthesystem,acolleagueofhishadmanagetowinapatentforoneofKirchoff'slaw,anobservationabout
问题描述：
OG12thGMAT句子分析上题
in1995Richard.Stallman,awell-knowcriticofthepatentsystem,testifiedinPatentOfficehearingsthat,totestthesystem,acolleagueofhishadmanagetowinapatentforoneofKirchoff'slaw,anobservationaboutelecticcurrentfirstmadein1845andnowinvirtuallyeverytextbookofelementaryphysics.
testifiedinPatentOfficehearingsthat中that是什么作用?hearing怎么理解?testifyin.这个是主句吗?
戴恩光回答：
主句是StallmantestifiedthatinPatentOfficehearings
that是宾语指示testify的方法totestthesystem.
hearings是听证会
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