Questions 28-30 Choose the appropriate letters A-D and write them in boxes 28-30 on your answer sheet. *

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问题 Questions 28-30
Choose the appropriate letters A-D and write them in boxes 28-30 on your answer sheet.

*

选项 A、each employed a staff of 500 clerks.
B、each had equal levels of productivity.
C、had identical patterns of organisation.
D、were randomly chosen for the experiment.

答案C

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