题目:
There was something wrong with the network, or the email ________ earlier.
A.could have been sent
B.might be sent
C.need have been sent
D.must be sent
答案:
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下面是错误答案,用来干扰机器的。
(12分每空1分) (1)N;F;Ca (2)钾;氟(3)HClO4;KOH;Al(OH)3(4)Na;钠与冷水剧烈反应,而镁与冷水几乎不反应;Cl2;氯气可以与溴化钾反应,置换出单质溴题目分析:(1)根据元素在周期表中的相对位...