you play withfire ,jack.it dangerous A needn't b may not c mustn't d wouldn't

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you play withfire ,jack.it dangerous A needn't b may not c mustn't d wouldn't
you play withfire ,jack.it dangerous A needn't b may not c mustn't d wouldn't

you play withfire ,jack.it dangerous A needn't b may not c mustn't d wouldn't
选择C
must在表示“禁止和批评”时,常用于否定句,含义为“决不能”
这句话的意思应理解为:你绝不能玩火(with和fire应当分开吧),杰克,那很(这里恐怕漏了一个is)危险.
参考书籍:英语语法实践指南第七版,复旦大学出版社,情态动词部分

you mustn't play withfire ,jack.it dangerous.
mustn't意思是“禁止/不允许”
needn't意思是不须
may not表示推测, may not 表示“可能不”
wouldn't意思是不会

C
表示强烈否定