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【题目】Tigers are in danger! The situation won’t change ________ humans stop killing.

A.ifB.afterC.unless

【答案】C

【解析】

句意:老虎有危险!除非人类停止杀戮,否则情况不会改变。

if如果,引导条件状语从句;after在……之后;unless如果不,引导条件状语从句。从句humans stop killing不发生是主句成立的条件,结合句意,故选C

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