The element radium, ______ in the chemistry lab, gave off a blue light.A．discove_刷题宝

题干

The element radium, ______ in the chemistry lab, gave off a blue light.

A．discovering

B．to be discovered

C．to discover

D．discovered

上一题下一题 0.85难度单项选择更新时间:2011-12-22 11:30:17

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