【题目】My granny does crossword puzzles each day ______ her mind sharp．
A．to keep B．kept
C．having kept D．to be kept
在线课程【答案】A
【解析】句意：我奶奶为保持思维敏捷常作字谜游戏。Keep one’s mind sharp保持思维敏捷。题干中缺少目的状语，只有不定式才能做目的状语。故选A。
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