Pupils often want to sit next to their particular friend and many classroom activities involve moving about, but even relatively

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问题 Pupils often want to sit next to their particular friend and many classroom activities involve moving about, but even relatively small alterations can make ______ to the visual comfort of pupils with sight defects.

选项 A、a difference
B、an interference
C、a modification
D、an impact

答案A

解析
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