单项选择题

A．based on
B．basing on
C．being based on
D．having based on
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单项选择题
A．strenuousB．tediousC．lustyD．nervous
A．strenuous
B．tedious
C．lusty
D．nervous
单项选择题
A．take upB．take toC．take onD．take in
A．take up
B．take to
C．take on
D．take in
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