There'snodoubtthatanyproposalwhichJackbedismissedmustberesisted.

参考答案:

A

结构应用。本句考察的是同位语从句的用法；因为Jack be dismissed must be resisted在句中作proposal的同位语，应用连接代词that引导，它在从句中不做任何语法成分；因此A为答案。