Don’t play with dog, Jack, for it _____ be dangerous at times.
A．shallB．canC．shouldD．must
B
shall用于第二、三人稱表示“允許，命令，警告，威脅”等；should表示“應該”；must表示“必須，一定”等；can除了表示“能，能夠，”外，還可表示“（有時）會，可能會”等。根據(jù)語境及情態(tài)動詞的意義比較可知，正確答案是C。
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