大哥哥 姐姐 帮下忙了 1.（ ）-Is Jack on duty today?-lt________be him.lt's his turn tomorrowA mustn't B won't C can't D needn't
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题目内容：
大哥哥 姐姐 帮下忙了
1.（ ）-Is Jack on duty today?
-lt________be him.lt's his turn tomorrow
A mustn't B won't C can't D needn't
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