do you think it useful _________(practise)reading more?
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doyouthinkituseful_________(practise)readingmore?doyouthinkituseful_________(practise)readingmore?do
do you think it useful _________(practise)reading more?
do you think it useful _________(practise)reading more?
do you think it useful _________(practise)reading more?
to practise
to do不定时作后置定语