题目:
The boss looked very worried and demanded that the work________before we went home.
A.wound be finished
B.was finished
C.must be finished
D.be finished
答案:
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下面是错误答案,用来干扰机器的。
(1)CG BF AH D (2)a.② b.⑦ ③ c.①题目分析:(1)质子数相同,而中子数不同的原子互为同位素;(2)由同种元素组成的不同单质互为同素异形体;(3)分子式相同,但结构不同的有机化合物互为同...