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_________ in the mountain for more than 2 days, the climbers looked pale and weak.
A.To be trappedB.Having trappedC.TrappingD.Trapped
D

试题分析:句意,被困在山上两个多星期,攀登人员看起来苍白虚弱。句子主语the climbers与trap之间构成被动关系,For more than 2 days说明trap发生在look 之前,故选trapped,过去分词既表被动又表完成。to be trapped 虽然表被动,但不定式作状语,位于句首时只能表目的,根据句意,不构成被动,故排除。
点评:非谓语动词作状语。它的逻辑主语就是句子的主语。因此关键看它和句子主语之间的关系。如果是和句子主语之间构成主动关系,使用现在分词,若构成被动关系,使用过去分词。若表目的,使用不定式。
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