单项选择题


A．doubt
B．suspicion
C．trouble
D．difficulty
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单项选择题
A．validB．efficientC．effectiveD．sufficient
A．valid
B．efficient
C．effective
D．sufficient
单项选择题
A．unceasinglyB．graduallyC．continuallyD．continuously
A．unceasingly
B．gradually
C．continually
D．continuously
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