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    精英家教网 > 高中英语 > 题目详情
    Messages ______ be changed from sound into electricity before they ______ be sent by radio.
    A．must; willB．have to; canC．can; mustD．need; may
    B
    本句意思是“信息得从声音转化成电子信号才能被送出去”。must和have to都可以翻译成“必须”，往往可以互用，但must表示的是说话人的主观看法，而have to则强调客观需要，如：The film is not interesting. I really must go now.
    I had to work when I was your age.
    本题很明显是强调客观需要。
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