It has been announced that all the students ____ put on masks before going to sc
题型：不详难度：来源：
| It has been announced that all the students ____ put on masks before going to school in case they are infected with SARS virus. |
答案
| A |
解析
试题分析：考查情态动词：句意：已经宣布所有的学生在上学前要戴面具以防感染SARS病毒，表示：规定或法律条文等用shall 语气强烈，will“意愿”，need“需要”，may“可以”，选A。 |
举一反三
—He should have come to join in the thorough cleaning.
—He _____. I don’t think it was his turn.| A．needn’t have to | B．needn’t have | | C．didn’t have to | D．doesn’t need to |
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I want to open the door, but it _____ open.| A．couldn’t | B．won’t | C．wouldn’t | D．mustn’t |
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No one ______ be more generous; he has a heart of gold.| A．must | B．dare | C．need | D．could |
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Looking after very young children _____ be very annoying sometimes, but you’ll get used to it after a while.| A．must | B．should | C．shall | D．can |
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— Who is absent from the lecture today?
—_____________you ask? Peter, of course.| A．Would | B．Can | C．Could | D．Need |
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