摘要：31．We can never expect a bluer sky we create a less polluted world． A．until B．if C．unless D．when
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We can never expect a bluer sky ________ we create a less polluted world．
A．until B．if C．unless D．when
查看习题详情和答案>>We can never expect ________ bluer sky unless we create ________ less polluted world.(2009安徽高考题)
A．a; a B．a; the C．the; a D．the; the
查看习题详情和答案>>
We can never expect ________ bluer sky unless we create ________ less polluted world．
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A．a; a
B．a; the
C．the; a
D．the; the