【題目】It is reported that China will not buy the Euro debt until some thorough research ______.

A. has been done B. will have been done

C. will be done D. had been done

【答案】A

【解析】

試題分析：考查時(shí)態(tài)及語態(tài)。句意：據(jù)報(bào)道，直到一些徹底的調(diào)查研究被做出以后，中國才會(huì)買進(jìn)歐盟債務(wù)，含有not ..until的狀語從句，主句一般將來，從句表示已經(jīng)做過研究之后，所以用完成時(shí)表示，研究與做之間又是被動(dòng)關(guān)系，由此綜合兩者，A正確。

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