题目列表(包括答案和解析)
We can never expect a bluer sky ________ we create a less polluted world．
A．until B．if C．unless D．when
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
We can never expect ________ bluer sky unless we create ________ less polluted world．
A．a; a
B．a; the
C．the; a
D．the; the
We can never expect _________ bluer sky unless we create _________ less polluted world．
A．a; a
B．a; the
C．the; a
D．the; the
We can never expect _________ bluer sky unless we create _________ less polluted world．
A．a; a
B．a; the
C．the; a
D．the; the
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