The secretary worked late into the night,___a long speech fo

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The secretary worked late into the night,___a long speech for the president.
A.to prepare B.preparing C.prepared D.was preparing

句中worked已经是谓语动词了,如果选D,句中就有两个谓语动词了,所以D错误.
现在分词表主动,过去分词表被动.由于“the secretary”与“prepare”是主动关系,所以C错误.
如果选A,就是动词不定式表示目的,如果选B,就是现在分词表示伴随状态.由于“worked”的实质就是“prepare a long speech for the president”,所以选A显然不符合句意.
所以选B.

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