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The old man wrote a letter to the hospital,____ his thanks .

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The old man wrote a letter to the hospital,____ his thanks .
The old man wrote a letter to the hospital,____ his thanks to the doctors who had cured his illness.
a.expressed b.expressing c.to express
为什么选B?A.C错哪?
首先你仔细看句子,这个句子的逗号前后都没有连词,说明这是一个句子,而不是两个句子,如果选A,则A不可能是谓语动词,因为没有连词.如果是非谓语动词,那么这个词是过去分词,表被动,当然也不对了,所以不选A.C是不定式,不定式表示将来,也不太合适.如果说是表示目的,那么就不该用逗号,所以只有B合适,是一种伴随状语.