2. 外语
  3. Classroom testing, if well done, most certainly______a stimulus to study and real learning.

Classroom testing, if well done, most certainly______a stimulus to study and real learning.

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问题 Classroom testing, if well done, most certainly______a stimulus to study and real learning.
选项 A、acts for
B、acts as
C、acts on
D、acts to
答案B
解析 考查固定搭配。A项意为“代理……”；B项意为“行为[表现]得像……”；C项意为“依据……行动”；D项意为“对……行动”。因此，B选项符合题意。
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