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As far as we know, half of Canadian teenagers do not get enough sleep on school nights, _____?

A.do they B.don’t they
C.don’t youD.isn’t it

A

解析试题分析:考查反意疑问句。主语为第三人称复数,句子也是否定句,因此反意疑问句用肯定的形式。句意:就我们所知,有一半的加拿大青少年都没有足够的夜间睡眠,是吗? 选A。
考点:考查反意问句
点评:主从句的反意问句,反问时,应和主句的主语保持一致。但当主句是I think,I suppose,I believe,I imagine等时,反意问句是和从句决定。当主句是第三人称的时候,就和主句一致,如果是否定前移,反意问句是肯定。

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