Question

--How long        your brother         this camera?

--For two weeks．

A. have；bought    B. have；had    C. has；had    D. has；bought

Answer

C

【解析】句意：你哥哥买这架相机有多久了？——两周了。根据答语可知，此处只能用延续性动词，buy为短暂性动词，不能与表示一段的时间状语连用，排除A,D；buy的延续性动词形式为have。your brother为第三人称单数形式，故答案为C。

点睛：现在完成时可以和带有 since 或 for 等表示“一段时间”的状语连用，表示动作或状态从某一时刻开始，一直持 续到现在。如：I haven't seen him for two years.

但是，像 come，arrive， buy 等终止性动词不能与表示“一段时间”的 状语连用。要用，必须改为“be（在）”等延续性动词来表述。现归纳总结一下由非延续性动词到延续性动词的转换：

arrive→ be here , die →be dead , begin(start)→be on , come back →be back, leave →be away, get up→ be up, finish →be over, open →be open , close →be closed, borrow →keep, join →be on /in 或 be a member of…, buy →have, catch(a cold)→ have(a cold), begin to study→ study, get to know →know , come to work→ work 等。如：He has been a soldier for three years.他参军三年了。

His father has been dead for two years.他父亲去世二年了。The film has been on for ten minutes.电影已开始十分钟了。We have studied English for three years. 我们（开始）学英语已三年了。