单项选择题

A necessary cause is _____.

A．one without which it is impossible for the effect to occur
B．one of the causes that can produce the effect
C．one that is enough to make the effect occur
D．none of them

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热门试题

单项选择题

This passage mainly discusses _____.

A．causal reasoning
B．various types of reasoning
C．classification of cause
D．the causal process