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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

 

【答案】

 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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