We ()tell her about it .She may have known it.A.don't have to B.mustn't

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We ()tell her about it .She may have known it.
A.don't have to
B.mustn't

填A,don't have to意思是不必,而mustn't意思是禁止
翻译是:我们不必告诉她,她可能已经知道了
希望对您有用,

A 客观因素。