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    精英家教网 > 高中英语 > 题目详情
    Don’t play with dog, Jack, for it _____ be dangerous at times.
    A．shallB．canC．shouldD．must
    B
    shall用于第二、三人称表示“允许，命令，警告，威胁”等；should表示“应该”；must表示“必须，一定”等；can除了表示“能，能够，”外，还可表示“（有时）会，可能会”等。根据语境及情态动词的意义比较可知，正确答案是C。
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