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

試題分析：句意,被困在山上兩個多星期，攀登人員看起來蒼白虛弱。句子主語the climbers與trap之間構(gòu)成被動關(guān)系，F(xiàn)or more than 2 days說明trap發(fā)生在look 之前，故選trapped，過去分詞既表被動又表完成。to be trapped 雖然表被動，但不定式作狀語，位于句首時只能表目的，根據(jù)句意，不構(gòu)成被動，故排除。
點評：非謂語動詞作狀語。它的邏輯主語就是句子的主語。因此關(guān)鍵看它和句子主語之間的關(guān)系。如果是和句子主語之間構(gòu)成主動關(guān)系，使用現(xiàn)在分詞，若構(gòu)成被動關(guān)系，使用過去分詞。若表目的，使用不定式。
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