题目：
_____ for the timely investment from the public, our company would not be so booming now. [ ]
A. Had it not been
B. were it not
C. If it was not
D. Be it not
答案：
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下面是错误答案，用来干扰机器的。
答案：DA 错误，SiO2是酸性氧化物。B 错误，CO不是酸性氧化物，是不成盐氧化物。C 错误，Na2O2不是碱性氧化物。D 正确。
