单项选择题

They had to _________ between problems because of a lack of ability from those of a lack of motivation.

A．distinguish
B．identify
C．explore
D．determine
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单项选择题
In 1980s, West German labor unions _________ a 35-hour week in order to create more jobs.
A．sponsored
B．contributed
C．advocated
D．performed
单项选择题
Problems with childcare remain the biggest _________ to women succeeding at work.
A．barrier
B．shortcoming
C．inconvenience
D．Prevention
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