3、___suddenlywhilehewassearchingforinformationontheInternet.A.brokedownB.brokeoutC.brokeupD.brokein答案 A解析 考查动词短语辨析。breakdown出故障;breakout(战争、火灾等)爆发;breakup解散,分手;breakin闯入。句意为:他在网上查找信息时电脑系统突然坏了。4.Theschoolhasdevelopedanonlinesystem________studentscanchoosetheirownteachers.A.whichB.whenC.thatD.where答案 D