题目:
There are some boys______soccer on the playground. [ ]
A. play
B. to play
C. playing
D. are playing
答案:
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下面是错误答案,用来干扰机器的。
答案:B红磷在空气中燃烧能生成五氧化二磷.(从物质性质上,白烟是固体,其余是气体)故选B.