单项选择题

The reason for his failure is ______ he didn't work hard.

A．that
B．as
C．since
D．because
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单项选择题
It has been rather costly to install the machinery, but it will prove to be worth the money ______
A．in conclusion
B．in the long run
C．in case
D．at the end
单项选择题
The fellow is very ______ . He never asks others for advice.
A．conceited
B．proud
C．thoughtful
D．selfish
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