The secretary worked late into the night,_______ a long, speech for the president.
A． to prepareB．was preparingC． preparedD．preparing
D

試題分析：考查現(xiàn)在分詞做狀語：句意：秘書忙到深夜給總統(tǒng)準備一篇很長的演講稿。這里是伴隨狀語，因為The secretary和prepare是主動關(guān)系，用現(xiàn)在分詞做狀語，如果沒有逗號,這里可以用to prepare,B是謂語動詞，選D。
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