单项选择题

A．on
B．in
C．behind
D．about
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单项选择题
A．usedB．spendC．costD．needy
A．used
B．spend
C．cost
D．needy
单项选择题
Some children learn to play the guitar because their parents ______.
A．play too
B．think it’s easy
C．force them
D．think it’s useful
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