Messages ______ be changed from sound into electricity before they ______ be sen

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Messages ______ be changed from sound into electricity before they ______ be sen

题型：不详难度：来源：
Messages ______ be changed from sound into electricity before they ______ be sent by radio.
A．must; willB．have to; canC．can; mustD．need; may

答案
B
解析
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。
举一反三
The whole building _____ burned down, but the heavy rain _____.
A．might have; would help
B．could have been; helped
C．must have; helped
D．should have been; was helping

题型：不详难度：| 查看答案
—Many people in England love to give advice on weather reporting.
—Yes, but I think the weather office’s computers _____ be more accurate.
A．canB．mustC．ought toD．might

题型：不详难度：| 查看答案
—Well, I forgot to bring my dictionary here yesterday.
—Actually you _____ it here. You were not allowed to use it.
A．needn’t bringB．needn’t have brought
C．didn’t need to bringD．don’t have to bring

题型：不详难度：| 查看答案
It has been announced that candidates ______ remain in their seats until all the papers have been collected.
A．canB．willC．mayD．shall

题型：不详难度：| 查看答案
How I wish every family ______ a large house with a beautiful garden!
A．hasB．hadC．will haveD．had had

题型：不详难度：| 查看答案
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