17、Computer lessons must be         to students of all grades，so that they can master this modern communication and learning tool．

    A．a(chǎn)voidable             B．a(chǎn)ccessible              C．valuable                 D．a(chǎn)cceptable

17、B

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Computer lessons must be         to students of all grades，so that they can master this modern communication and learning tool．

    A．a(chǎn)voidable             B．a(chǎn)ccessible              C．valuable                 D．a(chǎn)cceptable

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