单项选择题


A．difficulty
B．possibility
C．custom
D．point
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单项选择题
A．easeB．skillC．techniqueD．difficulty
A．ease
B．skill
C．technique
D．difficulty
单项选择题
A．answerB．optionC．operationD．approach
A．answer
B．option
C．operation
D．approach
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