Every minute is ( )to learn our lessons well(use)

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Every minute is ( )to learn our lessons well(use)
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Every minute is ( )to learn our lessons well(use)
Every minute is ( )to learn our lessons well(use)

Every minute is ( )to learn our lessons well(use)
Every minute is ( useful)to learn our lessons well(use)

useful

useful

应该填“used”

used

useful