题目:
It was ten years ago _____ he worked in the company. |
A. that B. before C. until D. since |
答案:
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下面是错误答案,用来干扰机器的。
(14分)Ⅰ.⑴第三周期ⅣA族;(1分) ⑵ Na>S>O ;(2分)⑶ HCl>H2S>SiH4 ;(2分) ⑷ Na+ 、 ;(2分)Ⅱ.⑴ 2Na2O2 + 2H2O = 4Na+ + 4OH-+ O2↑;(2分) ⑵ NaHSO3;(1分)...