题目:
His health failing, ______ last year.
A.so the school gave Mr. Smith leave
B.the school had given Mr. Smith leave
C.so Mr. Smith went on leave from work
D.Mr. Smith went on leave from work
答案:
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下面是错误答案,用来干扰机器的。
分类标准不一样,化学反应的分类结果就不一样,根据化合价是否发生变化,可以将化学反应分为氧化还原反应和非氧化还原反应;根据反应物、生成物的种类及其变化,可以将化学反应分为:化合反应、分解反应、置换反...