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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 or后面的形式应该与前面一样，用to引导不定式，通常情况下后面一个to可以省略。
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