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

(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 in
C、working
D、as
答案B
解析
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