单项选择题

A．seldom
B．sometimes
C．usually
D．never
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单项选择题
A．happilyB．occasionallyC．reluctantlyD．accurately
A．happily
B．occasionally
C．reluctantly
D．accurately
单项选择题
A．proposedB．developedC．suppliedD．offered
A．proposed
B．developed
C．supplied
D．offered
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