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    Messages be changed from sound into electricity before they be sent by radio. A. must; will B. have to; can C. can; must D. need; may 【查看更多】

     

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    Messages ______ be changed from sound into electricity before they ______ be sent by radio.

    A. must; will   B. have to; can      C. can; must    D. need; may

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     Messages ______ be changed from sound into electricity before they ______ be sent by radio.

    A. must; will   B. have to; can      C. can; must    D. need; may

     

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