单项选择题


A．portion
B．percentage
C．proportion
D．fraction
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单项选择题
A．BecauseB．WhileC．SinceD．When
A．Because
B．While
C．Since
D．When
单项选择题
A．live up toB．catch up onC．put up withD．keep up with
A．live up to
B．catch up on
C．put up with
D．keep up with
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