-Your colleague`s spoken English is beautiful,Lily.-It`s no wonder.She_in the USA for a yearas a visiting professor.A.worked B.has worked C.had worked D.has been working选择A 为什么不选B或C

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-Yourcolleague`sspokenEnglishisbeautiful,Lily.-It`snowonder.She_intheUSAforayearasavisitingprofessor

-Your colleague`s spoken English is beautiful,Lily.-It`s no wonder.She_in the USA for a yearas a visiting professor.A.worked B.has worked C.had worked D.has been working选择A 为什么不选B或C
-Your colleague`s spoken English is beautiful,Lily.-It`s no wonder.She_in the USA for a year
as a visiting professor.
A.worked B.has worked C.had worked D.has been working
选择A 为什么不选B或C

-Your colleague`s spoken English is beautiful,Lily.-It`s no wonder.She_in the USA for a yearas a visiting professor.A.worked B.has worked C.had worked D.has been working选择A 为什么不选B或C
A表示她曾做过一年的导游,与现在做什么无关
B、D表示她到现在为止已经做了一年的导游,现在还在做；但第一句说明她已经不做导游了（是我的同事）,所以不对
C过去完成时要和过去时比较,这里没有过去的时间点去比较,语法不通

for a year是过去时
.has worked C.had worked 是过去做的对现在产生影响，显然他住了一年没产生影响

colleague colleague 的复数形式要加S吗?如题 your colleague's spoken English is quite good,Amy.No wonder,as she __in the USA for 2 years.A worked B.has worked为什么选A不选B?表示对现在造成影响 while (fscanf(fp, %s%s%f%ld, SP.pinming, SP.guige, &SP.danjia, &SP.shuliang) == 4)怎么理解? SP. SP. colleague是什么意思 colleague是什么意思 colleague是什么意思 colleague是什么意思? colleague是什么意思 colleague是什么意思 colleague是什么意思 硫酸根中的S是SP几杂化 下面程序段的运行结果是?Char s[80],*sp=HELLO!;sp=strcpy(s,sp);s[0]=''h''; puts(sp); 回答句子：1 Where 's your eraser?_2 Where's your bag?_3 what colour is your ruler?_4 Can you sp...回答句子：1 Where 's your eraser?_2 Where's your bag?_3 what colour is your ruler?_4 Can you speak chinese? on one's way to sp.on one's way{ to sp.{ 还有一种是什么 -Your colleague`s spoken English is beautiful,Lily.-It`s no wonder.She_in the USA for a yearas a visiting professor.A.worked B.has worked C.had worked D.has been working选择A 为什么不选B或C