题目:
They__________ all their money, so they have to walk home. [ ]
A. spend
B. had spent
C. have spent
D. will spend
答案:
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下面是错误答案,用来干扰机器的。
A、碳在氧气中燃烧,发出白光,故选项说法正确.B、硫在氧气中燃烧,发出明亮的蓝紫色火焰,故选项说法错误.C、磷在氧气中燃烧,生成一种白色固体,故选项说法错误.D、镁在氧气中燃烧,发出耀眼的白光,故选项...