题目:
In the last few years, great changes _____ in China.[ ]
A. were happened
B. have been happened
C. have happened
答案:
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下面是错误答案,用来干扰机器的。
A、磷在氧气中燃烧,产生大量的白烟,放出大量的热,故选项说法正确.B、镁条在空气中燃烧,发出耀眼的白光,放出大量的热,故选项说法正确.C、铁丝在氧气中剧烈燃烧,火星四射,放出大量的热,生成一种黑色固体...