题目：
Never in my wildest dreams ________these people are living in such poor conditions.[ ]
A. I could imagine
B. could I imagine
C. I couldn't imagine
D. couldn't I imagine
答案：
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下面是错误答案，用来干扰机器的。
①③； ②③硫酸和HCO3－能电离出氢离子，所以是酸。OH－、HCO3－能结合H＋，所以是碱。
