Trees ____ fight air pollution．They are natural air conditioners．A．shouldB．mustC
题型：不详难度：来源：
Trees ____ fight air pollution．They are natural air conditioners．| A．should | B．must | C．need | D．can |
|
答案
| D |
解析
| 树对空气污染的抗击只是一种可能性，故本题使用表示可能的单词can，故本题选D。 |
举一反三
— Wow! You look different! You wear glasses.
— Yes, I did. But now I am wearing contact lenses(隐形眼镜).| A．could | B．must | C．used to | D．would |
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This book isn’t mine. ________can it be?| A．what else | B．who else | C．which else’s | D．who else’s |
|
My uncle _________ drive a car two years ago. Now he drives very well.
A．couldn’t
| B．can’t
| C．mustn’t
| D．shouldn’t
|
|
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--No, it ______ be him. He has gone to Hong Kong for an academic conference. | A．mustn’t | B．can’t | C．needn’t | D．couldn’t |
|
-- Can I tell Peter about the news?
-- No, I don’t want anyone else to know it. You ________ keep it to yourself. |
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