单项选择题

A．live up to
B．catch up on
C．put up with
D．keep up with
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单项选择题
A．as usualB．as wellC．as beforeD．as such
A．as usual
B．as well
C．as before
D．as such
单项选择题
A．portionB．percentageC．proportionD．fraction
A．portion
B．percentage
C．proportion
D．fraction
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