单项选择题

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.

A．a difference
B．an interference
C．a modification
D．an impact
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单项选择题
The Commission found instances where police officers had lied under oath, ______evidence, neglected black prisoners and wrongly imprisoned Aborigines.
A．entailed
B．fabricated
C．cleansed
D．precluded
单项选择题
He did not tell his parents because he knew they would try to change his mind but he______in a colleague at work.
A．involved
B．joined
C．engrossed
D．confided
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