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高2英语过去分词1 Unless _____ to speak,you should remain silent at

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高2英语过去分词
1 Unless _____ to speak,you should remain silent at the meeting.
A.asked B.asking C.being asked D.having asked
2 When ____,the museum will be open to the public next year.
A.to be completed B.completing C.being completed D.completed
答案都是过去分词
但1我想选being asked
2我想选 to be completed
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