(There are) twelve people (take part) in the experiment, four (working) (as) a group.

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问题 (There are) twelve people (take part) in the experiment, four (working) (as) a group.

选项 A、There are
B、take part
C、working
D、as

答案B

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