单项选择题


A．few
B．number
C．deal
D．supply
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单项选择题
A．studiedB．researchedC．surveyedD．observed
A．studied
B．researched
C．surveyed
D．observed
单项选择题
A．heldB．takenC．gotD．developed
A．held
B．taken
C．got
D．developed
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