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

A.ifB.afterC.unless

【答案】C

【解析】

句意:老虎有危險(xiǎn)!除非人類停止殺戮,否則情況不會(huì)改變。

if如果,引導(dǎo)條件狀語(yǔ)從句;after在……之后;unless如果不,引導(dǎo)條件狀語(yǔ)從句。從句humans stop killing不發(fā)生是主句成立的條件,結(jié)合句意,故選C

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