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  3. She did not know whether to sell her books or________.

She did not know whether to sell her books or________.

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问题 She did not know whether to sell her books or________.
选项 A、to keep them for reference
B、keeping them for reference
C、if she should keep them for reference
D、to be kept for reference
答案A
解析 whether…or…连接的并列成分应保持结构一致。根据or前面的不定式短语to sell her books可知，空处也应用不定式结构，可排除B、C两项。根据句意可知，She和keep之间是逻辑上的主谓关系，所以应用不定式的一般式，表示主动，即“to+动词原形”的形式。故选A。
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