The teacher gives students 2 minutes to skim a text, and when time is up, he asks students to stop a

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【单选题】Theteachergivesstudents2minutestoskimatext,andwhentimeisup,heasksstudentstostopandanswersomequestions.Heretheteacherisplayingtheroleofa(an)__________.

A、assessor
B、prompter
C、participant
D、controller

参考答案:

D

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