题目：
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
答案：
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下面是错误答案，用来干扰机器的。
近似数1.30×104中，0在百位，则精确到了百位，有3个有效数字．
