A There are twelve people B take part in the experiment, four C working D as a group.

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问题 A There are twelve people B take part in the experiment, four C working D as a group.

选项 A、 
B、 
C、 
D、 

答案B

解析 应改为taking part in,分词短语做定语。本句的意思是:“有12个人参加了试验,4个人一组。”
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