The rain has flooded drainage canals in many orange-tree groves, which has caused the fruit to fall before it will ripen and also threatened to kill the trees.


which has caused the fruit to fall before it will ripen and also threatened to kill

which not only caused the fruit to fall without ripening, but also threatened killing

not only causing the fruit to fall before ripening, but also threatening to kill

causing the fruit to fall before it will ripen, which will threaten killing

causing the fruit to have fallen before it ripened, which threatened to kill

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题目分析：
(A)中的which引导了一个非限定性定语从句，依照就近修饰原则，其先行词为rain（因为其后的谓语动词has是单数，而前句中只有rain是单数）；(B)中其先行词为many orange-tree groves；(C)(D)(E)选项为伴随状语，所以cause的主语为rain。其次，前后两个小句之间的关系也有差异，在(A)(D)(E)中，两个小句之间是and关系（解释关系）；在(B)(C)中，两个单句属于递进关系。

选项分析：

A选项：“引起水果掉下”和“让树木死亡”应是递进关系（水果掉下来比让树木死亡的程度低多了），而不是本选项所描述的并列关系。

B选项：which引导的定语从句会就近修饰名词orange-tree groves。但在逻辑上，发出“引起水果下落”等动作的应该是rain。

C选项：Correct. 本选项在语法和逻辑上均是正确的。

D选项：“引起水果掉下”和“让树木死亡”应是递进关系，而不是本选项中的修饰关系。

E选项：本选项错误同(D)。

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