单项选择题

Playing electronic games for hours ______ does great harm to one's eyesight.

A．on purpose
B．on end
C．on business
D．on schedule
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单项选择题
Many words in English have ______ new senses with the passage of time and social development.
A．embarked on
B．concentrated on
C．taken on
D．turned on
单项选择题
Beginners of English are ______ to make many grammatical errors in speech.
A．possible
B．probable
C．subject
D．likely
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