新概念英语第四册第十七单元语法和句型(教学用).doc

文档介绍：新概念英语第四册第十七单元语法和句型(教学用)新概念英语第四册第十七单元语法和句型Lesson17Aman-madedisease人为的疾病IntheearlydaysofthesettlementofAustralia,,(andapparentlynootheranimal)wassusceptibletoafatalvirusdisease,,,,,however,,Europe,whichhadbequeathedtherabbitasapesttoAustraliaacquiredthisman-,however,,anditspreadtoBritainwherewildrabbitsareregardedasapestbutwheredomesticatedrabbits,equallysusceptibletothedisease,.【语法点】情态动词+完成体不定式【课文原句】Itcauseddevastationbyburrowingandbydevouringtheherbagewhichmighthavemaintainedmillionsofsheepandcattle.【闯关例句】。Jack________(肯定有事耽误了)