问题描述：
几道英语单选
1.Hestoodthere____,notknowingwhattodo.
AhelplesslyBhelpless
为什么选B不选A
2.Ididvery____thefirsttimeItookmyentranceexamination.
A.poorlyB.poor
为什么
3.Thestaffinofficedonotconsidertheirboss____anymoreaftertheyhaveknownthatheforgeshiscertificate.
A.respectiveB.respectingC.respectableD.respectful
为什么