单项选择题

If he's alone, Juan likes to play action video games ______ they aren't too violent.

A．as long as
B．as long so
C．so long so
D．as long till
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单项选择题
How close adults are to their youngsters ______ a strong influence on the development of the children's character.
A．have
B．has
C．having
D．to have
单项选择题
Johnson's younger brother, though 6 years old, is very quick ______ doing calculations.
A．of
B．on
C．in
D．by
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