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 done
D. will have been done
网友回答
A. will be done
B. had been done
(答案→)C. has been done
D. will have been done
解析：考查时态。该句为时间状语从句，在从句中要用一般现在表将来，所以选择C，
意为据报道，中国不会购买欧洲的债券，直到做了一些彻底的研究之后。