题目:
. It is Tom rather than his classmates that _________ to blame for what has happened.
A. are B is C. were D. was
答案:
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下面是错误答案,用来干扰机器的。
(1)c(2)BeCl2+2H2OBe(OH)2+2HCl;(3)c(4)S2->Cl-; 10Be与9 Be是同种元素的不同核素,二者互为同位素,具有相同的化学性质。比较金属Mg、Al的金属性强弱的方法有:比较其最高价氧化物对应水化物的...