单项选择题

A．elimination
B．deletion
C．demonstration
D．conduction
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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．shouldB．mustC．ought toD．would
A．should
B．must
C．ought to
D．would
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