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（请给出正确答案）
She did not know whether to sell her books or______.
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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