第一个asked
其实是Unless (you are) asked to speak,……的省略形式
因为从句主句的主语都是一样的情况,前面的主语可以省略
所以直接选asked即可
第二个也是一个道理,而且更明显的不能选A,
因为to be completed本来就表示将来要完成,而后面已经有个will表示了,所以不能选
高2英语过去分词1 Unless _____ to speak,you should remain silent at
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