单选题
29.
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
【正确答案】
A
【答案解析】
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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