单项选择题

Steven's ability to learn from observations and experience ___________ greatly to his success in public life.

A．related
B．attached
C．attributed
D．contributed
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单项选择题
Color-blind people often find it difficult to ___________ between red and green.
A．identify
B．distinguish
C．separate
D．compare
单项选择题
Many people were deprived ___________ food and clothing in order to supply the growing armies.
A．for
B．of
C．by
D．from
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