单项选择题

His wife had the front door painted green yesterday,_____ she

A．did
B．didn’t
C．had
D．hadn’t
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单项选择题
The reason why some people are unlikely to succeed in life is that they________.
A．have ruined their talents
B．have taken on an unsuitable job
C．think of nothing but their salary
D．are not aware of their own potential
单项选择题
A smaller population may mean_________.
A．higher productivity, but a lower average income
B．lower productivity, but a higher average income
C．lower productivity, and a lower average income
D．higher productivity, and a higher average income
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