问题标题：
ItisreportedthatChinawillnotbuytheEurodebtuntilsomethoroughresearch______．（）A.hasbeendoneB.willhavebeendoneC.willbedoneD.hadbeendone
问题描述：
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
万昌江回答：
答案：A．本句中it为形式主语，that引导一个主语从句．在主语从句中又包含一个until引导的时间状语从句，因为主句中China will not buy the Euro debt为一般将来时，所以从句中的时态...
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