算法用来描述问题的解决方案,是具体的、机械的()。利用计算机解决问题最重要的步骤就是将人的想法描述成()。
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I haven’t brought my pen with me. _______ I use yours ?
A. Must
B. May
C. Need
D. Shall
“Must we finish the work before 8 ?” “No, you _______.”
A. needn’t
B. can’t
C. mustn’t
D. won’t
It is a fine day today. You _______ take a raincoat with you.
A. mustn’t
B. can’t
C. may
D. needn’t
“May I go out tonight ?” “No, you _______.”
A. mayn’t
B. needn’t
C. don’t
D. mustn’t