The teacher gives three minutes to skim a text,and when time is up,he asks students to stop and answer the question. What role is the teacher playing in this activity?_做题室

单项选择题 The teacher gives three minutes to skim a text,and when time is up,he asks students to stop and answer the question. What role is the teacher playing in this activity?: A、 Assessor.; B、 Controller.; C、 Participant.; D、 Prompter.

正确答案：B
答案解析：
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