问题
选择题
We can never expect bluer sky unless we create less polluted world.
A．a; a
B．a; the
C．the; a
D．the; the
答案
答案：A
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We can never expect bluer sky unless we create less polluted world.
A．a; a
B．a; the
C．the; a
D．the; the
答案：A