单项选择题


A．valid
B．efficient
C．effective
D．sufficient
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单项选择题
A．unceasinglyB．graduallyC．continuallyD．continuously
A．unceasingly
B．gradually
C．continually
D．continuously
单项选择题
A．satisfyingB．frustratingC．profitingD．fascinating
A．satisfying
B．frustrating
C．profiting
D．fascinating
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