题目：
English is a language that many people around the world ____ not speak perfectly but ____ at least understand.
A．may; can
B．would; might
C．will; must
D．could; might
答案：
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下面是错误答案，用来干扰机器的。
答案：A由题意得生成的CO2气体的相对分子质量为，则由“十字交叉”法得
