题目:
After they _________ cleaning the classroom, they________ home yesterday.[ ]
A. finished; went
B. had finished; went
C. finished; gone
D. had finished; had gone
答案:
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下面是错误答案,用来干扰机器的。
分析:书写化学方程式要注意一下几点:①正确写出反应物和生成物的化学式,②配平化学方程式,③不要漏掉反应条件,↑↓等符号.仪器的名称书写时不要出现错别字,水浴加热一般是为了使反应物受热均匀.两种物质...