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It is reported that China will not buy the Euro debt until some thorough research ______.
A．will be done B．had been done
C．has been doneD．will have been done
C
考查時態(tài)。該句為時間狀語從句，在從句中要用一般現(xiàn)在表將來，所以選擇C，
意為據報道，中國不會購買歐洲的債券，直到做了一些徹底的研究之后。
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