Most children can't c____ on one thing for a long time.

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Most children can't c____ on one thing for a long time.
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Most children can't c____ on one thing for a long time.
Most children can't c____ on one thing for a long time.

Most children can't c____ on one thing for a long time.
concentrate
concentrate on sth 集中在某事上

concentrate

concentrate