_____rapidly by the body, sugar provides a quick energy source.

A. Digested                   B. Digesting               C. To digest                   D. Having digested

D

解析： 在做這道題時，不少考生誤用了“表示前面的話里或上文提到過的人或事物要用定冠詞”這一語法規(guī)則，將A作為正確答案。其實(shí)，這里的black one并非特指上文提到的pen。答話人表達(dá)的是“是一支黑色的鋼筆嗎”這一意思，故正確答案是D。

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