根据下面资料，回答题 Lastweek,whenwelearnedthenewword"slovenly",weaskedtomakeasentencewithit.Ivolunteeredtodoitbysaying"Mydeskmateisaslovenlygirlwhoclothesneverfither."Hearingthis,awholeclassburstintolaughterandmydeskmatefaceturnedred.Afterclass,Ilearnedupfromtheteacherthatmydeskmatewouldhavedroppedoutofschoolifshehadn′tbeenhelpedwithothers.Mymindlesswordsmusthavehurthimdeeply.NotuntilthendoIrealizewordscouldbepowerfullyinbothpositiveandnegativeways.Weshouldavoidhurtothersifourwordsarenotencouraging. 第五处
删掉learn后的up。解析：考查固定短语。learn from sb．意为“向某人学习，从……获知”。
