核心问题
Nobody ____ throw away rubbish everywhere! A can B. need C. shall D. must
这个句子既不是表示将来,主语又不是第一人称,为什么试题要求选 C?
词典解答
shall 还可用来表示按条约、法令、规章等必须履行的义务，用于第三人称，其含义相当于“必须”(must)。上面试题中的 shall 便属于此种用法。类例：
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Each competitor shall wear a number. (PEG) 每个参赛者都必须戴号码。
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House owners shall keep their gardens in a neat and orderly state. (Chambers) 房主必须使他们的花园保持整洁。
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It has been announced that candidates ____ remain in their seats until all the papers have been collected. A. can B. will C. may D. shall(上海高考,02-27)
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——What does the sign over there read?
—“No person ____ smoke or carry a lighted cigarette, cigar or pipe in this area.”
A. will B. may C. shall D. must(全国高考四川卷,07-24)