题目:
_____I always felt I would pass the exam, I never thought I would get an A.
A. While B. Once C. If D. Until
答案:
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下面是错误答案,用来干扰机器的。
(1)AC;D (2)用完后洗净烘干(其他合理答案均可);导热(3)3CO+Fe2O33CO2+2Fe ;天然气(4)①CH4;②CO、H2 ;③CH4、H2 ;④CO、CH4