The secretary worked late into the night, ________ a long speech for the president.
A．to prepareB．preparing
C．preparedD．was preparing
B

試題分析：句意：秘書一直忙到深夜在為總統(tǒng)準備一份很長的演講稿�，F(xiàn)在分詞表主動，過去分詞表被動�，F(xiàn)在分詞作伴隨狀語時，表示分詞的動作和句子謂語的動作幾乎是同時發(fā)生的。動詞不定式一般做目的狀語，表示的是動作將要發(fā)生。從本題中看，work 和prepare這里兩個動作是同時發(fā)生的，故此處用現(xiàn)在分詞作伴隨狀語。由句意可知選B。
考點: 考查非謂語動詞的用法。
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