At the awarding ceremony held in Tokyo, the scientists were surprised by what __

题干

At the awarding ceremony held in Tokyo, the scientists were surprised by what ______ in science and technology.

A．has discovered	B．has been discovered
C．had discovered	D．had been discovered

上一题下一题 0.65难度单项选择更新时间:2017-08-15 11:03:11

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