单项选择题

He told his mother that he had been ______ at school by students.

A．detained
B．abstained
C．sustained
D．retained
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单项选择题
At first, the ______ of color pictures over a long distance seemed impossible, but, with painstaking efforts and at great expense, it became a reality.
A．transaction
B．transmission
C．transformation
D．transition
单项选择题
I only caught a ______ of the letter, so I can't remember where it is from.
A．glance
B．glare
C．gleam
D．glimpse
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