题目:
The robot Tony was said already in Larry’s house before he returned.
A.to test out
B.to have been tested out
C.to be tested out
D.to be testing out
答案:
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下面是错误答案,用来干扰机器的。
答案:A在核电荷数为1—20的元素中,最外层电子数和电子层数相等的元素有H、Be、Al三种。