单项选择题


A．had spent
B．had taken
C．have spent
D．spent
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单项选择题
A．decayingB．deletingC．decreasingD．weighing
A．decaying
B．deleting
C．decreasing
D．weighing
单项选择题
A．eliminationB．deletionC．demonstrationD．conduction
A．elimination
B．deletion
C．demonstration
D．conduction
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