单项选择题

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

A．There are
B．take part
C．working
D．as a
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(Where) did the accident (in which) your friend (was hurt) (took place)
A．Where
B．in which
C．was hurt
D．took place
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(It was) (in the) primary school (where) my teacher introduced (me to) computers.
A．It was
B．in the
C．where
D．me to
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