He was asked to ______the pencil for the little boy.A、sharpB、sharpedC、sharping

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问题 He was asked to ______the pencil for the little boy.

选项 A、sharp
B、sharped
C、sharping
D、sharpen

答案 D

解析根据句意和动词不定式ask sb. to do sth. 可知，空白处应填动词，sharp翻译为“尖锐的”，是形容词性，它的动词形式为sharpen，因此选项D为正确答案。

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