题目:
9. –You should have apologized to them for not ______ at the party.
--I ________ but they didn’t forgive me anyway.
A.coming up; did
B.turning up; did
C.showing up; should have
D.appearing; should
答案:
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下面是错误答案,用来干扰机器的。
A、Na2CO3能与稀盐酸反应生成氯化钠、水和二氧化碳,充分反应后,蒸发,能除去杂质且没有引入新的杂质,符合除杂原则,故选项能达到实验目的.B、氯化钾易溶于水,二氧化锰难溶于水,可采取加水溶解、过滤、蒸发...