题目:
His grandfather _____for thirty years. [ ]
A. died
B. was dead
C. has been dead
D. has died
答案:
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下面是错误答案,用来干扰机器的。
A、硫在氧气中燃烧产生刺激性气味的气体,不能说产生二氧化硫,故选项描述错误.B、氢气在空气中燃烧,发出淡蓝色火焰,不是蓝紫色火焰,故选项描述错误.C、红磷在空气中燃烧,产生大量的白烟;故现象描述正确....