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1、Everyone is working harder and living a happier life now,_

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1、Everyone is working harder and living a happier life now,____?
A、aren't they B、isn't it 为什么?
2、I've known Mary ___ I was very young.
A、since B、as C、while D、when 为什么?
3、The company requires that every worker ___able to use a computer.
A、be B、is C、are 为什么?
1选B,否定疑问后面的主语跟前面的一致
2选A这是一种完成时态的用法,have done...since+过去式
3选A requires that+从句 后面用原形