单项选择题


A．could
B．would
C．should
D．did
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单项选择题
A．officiallyB．usuallyC．generallyD．seasonally
A．officially
B．usually
C．generally
D．seasonally
单项选择题
A．hang onB．hang toC．hang upD．hang about
A．hang on
B．hang to
C．hang up
D．hang about
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