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(yǔ)：句意：秘書忙到深夜給總統(tǒng)準(zhǔn)備一篇很長(zhǎng)的演講稿。這里是伴隨狀語(yǔ)，因?yàn)門he secretary和prepare是主動(dòng)關(guān)系，用現(xiàn)在分詞做狀語(yǔ)，如果沒(méi)有逗號(hào),這里可以用to prepare,B是謂語(yǔ)動(dòng)詞，選D。
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