Doctors say that exercise is important for health,but it__________be regular e
题型：不详难度：来源：
Doctors say that exercise is important for health,but it__________be regular exercise . |
答案
| C |
解析
| 动词辨析。can 能够，可能；will愿意，下决心；must 必须，一定；may 可以。句意：医生说锻炼对健康很重要，但是得下决心定期锻炼。故选C。 |
举一反三
---I haven’t got the reference book yet, but I’ll have a test on the subject next month.
---Don’t worry. You______ have it by Friday.| A．could | B．shall | C．must | D．may |
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Mark_______have hurried. After driving at top speed .he arrived half an hour early.| A．needn’t | B．wouldn’t | C．mustn’t | D．couldn’t |
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“Is Jack on duty today?”“It ____ be him. It’s his turn tomorrow.”| A．mustn’t | B．won’t | C．needn’t | D．can’t |
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If I were to have time, I to the theatre tomorrow evening.| A．would have gone | B．should go | C．had gone | D．were to go |
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. My pain ___________ obvious the moment I walked into the room, for the first man I met asked me pitifully:" Are you feeling all right?"| A．must be | B．must have been | | C．could be | D．could have been |
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