________ in the company for three years,Mark has become expe

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________ in the company for three years,Mark has become experienced in business negotiations.
A) Having worked
　　B) Have been working
　　C) Have worked
　　D) Worked
为什么选A?

我用排除法给你解析下,首先是D,动词开头做一个句子的是没有的,除非前面有主语,C也是,B的话有个working ,但它这里用的是被动语态,与题意是不符合的,mark是人,做工作是他自己做的,而不是被做的,到最后,A,这里having.是做伴随状语,意思是随着他在公司工作了3年,表示一段时间他做了什么事

________ in the company for three years,Mark has become expe She has worked in the school for three years .The factory has been ________ for three years.A.to open B.o The factory has been ________ for three years.A.to open B.op Li Ping has worked in the company for many years.He is a m__ he has worker in the company for 15 years H ,he does not lik He has worked in the company for 15 years.H ( ) ,he,doesn~t 33.In the past few years,traffic problems (become) ________ The Smiths has been in China for three years.The Smiths ____ He is a s______ and he has been in the army for three years 1.He has been in the army for three years?_____ _____three y He is a s___ and he has been in the army for three years.