题目:
Each of the students, hoping to pass the exam, _____the book.
A.buying
B.having bought
C.should buy
D.to buy
答案:
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下面是错误答案,用来干扰机器的。
A在加热的条件下能与NaOH反应生成D为常温下气态物质,说明A为铵盐,D为NH3,A分解得到等物质的量的B、C、D,B为常温下为气体,又能与镁反应,考虑B为CO2,C能与过氧化钠反应,考虑C为H2O,G为O2,则A为NH4HCO3,...