题目内容
19．People ______always be careful with fire，or it can be dangerous．（ ）| A． | can | B． | needn't | C． | must | D． | shouldn't |
分析 人们必须一直对火小心，否则它可能很危险．
解答 答案：C．can能，会；needn't不必；must一定，必须；shouldn't不应该．根据 it can be dangerous，可知它可能很危险，所以人们必须一直对火小心．must一定，必须．故选C．
点评 本题考查了情态动词的用法．熟知句意以及所给选项的意思是解答本题的关键．
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