Water ____ be changed into vapour but it ____ be heated to its boiling point .
A．may ; canB．can ; must C．may ; needn''t D．must ; may
B
can表示可能性，must必須，表示條件。
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：不詳 題型：單選題

—_______ I book a table for dinner in advance??
—Yes,you _______.The restaurant is always full of people.?
A．Must;canB．Will;will
C．Shall;needD．Shall;must

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

I must say he reads very well，and I shouldn’t be surprised if he__________acting for a living one day.
A．had taken upB．takes up ?
C．have taken upD．would have taken up?

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

— What has happened to Tom ?
— I don''t know . He ____ lost .
A．could getB．might yet C．can have gotD．may have got

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

This car looks like mine , yet it isn''t . Whose ____ .
A．can B．could C．may D．must

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

He commanded that all the gates __________.
A．should shutB．would be shutC．shutD．be shut

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

—Can we ski on this mountain??
—Of course.However, at no time _______ you do so alone.?
A．couldB．might
C．needD．must?

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

—What do you think we can do for our aged parents？
—You　　　　do anything except that you visit them as often as possible.
A．don’t have toB．oughtn’t to
C．mustn’tD．shouldn’t

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

There is a real possibility that these animals could be frightened，__________a sudden loud noise.?
A．being thereB．should there be?
C．there wasD．there having been?

查看答案和解析>>

同步練習(xí)冊答案