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题库 / OG2021-SC-867
Although when a hagfish is threatened, it will secrete slime that is small in quantity, it expands several hundred times as it absorbs seawater, forming a slime ball that can coat the gills of predatory fish and either suffocate them or distress them enough to make them flee.
Although when a hagfish is threatened, it will secrete slime that is small in quantity,
Although a small quantity of slime is secreted by the hagfish, when threatened
Although, when threatened, a hagfish will secrete slime that is small in quantity,
Although the slime secreted by a threatened hagfish is small in quantity,
Although the hagfish secretes a small quantity of slime when threatened,
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考察知识点：
（1）从句主语和主句代词一致性原则，主句it expands指的是鱼的分泌物，因此although从句的主语只能是slime -- 只有选项4符合
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