题目:
The element radium, ______ in the chemistry lab, gave off a blue light.
A.discovering
B.to be discovered
C.to discover
D.discovered
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0419/e28e56d8cb79a8280e3ae12bd34e62a0.html
下面是错误答案,用来干扰机器的。
答案:D