单项选择题

A) whatever C) whenever
B) no matter D) whether

A．whatever
B．no matter
C．whenever
D．whether
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单项选择题
A) diversity C) generalization B) extinction D) degradation
A．diversity
B．extinction
C．generalization
D．degradation
单项选择题
A) opportunity C) courtyard B) perform D) forum
A．opportunity
B．perform
C．courtyard
D．forum
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