问题标题：
1.Ifeelitmyduty___youwithyourEnglish.答案选A我选CA.tohelpB.helpC.helpingD.helped2.Iheardher___toherteacher.答案选D我选AA.tosayhelloB.sayinghelloC.totellhelloD.sayhello3.Wewentona___safari(旅行,狩猎远征）___
问题描述：
1.Ifeelitmyduty___youwithyourEnglish.答案选A我选C
A.tohelpB.helpC.helpingD.helped
2.Iheardher___toherteacher.答案选D我选A
A.tosayhelloB.sayinghelloC.totellhelloD.sayhello
3.Wewentona___safari(旅行,狩猎远征）____thatday.答案选B我选C
A.two-days,byjeepB.two-day,inajeepC.two-day,byajeep
D.twodays,inajeep
4.Theyare___.答案选C我选B
A.teeth-brushB.teethbrushesC.tooth-brushesD.teethbrush
郭爱煌回答：
1.it是形式宾语.feelit+n./adj.todo是固定用法todosth.才是真正的宾语
2.heartsbdosth表示听见某人做过某事,指事情已经发生而hearsbdoingsth表示听见某人正在做某事,指事情正在进行.类似的词语还有see
3by后加交通工具中间不加任何冠词如bybusbybike
4.合成词的复数形式是在第二个词后变复数如grown-ups成年人
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