2. 外语
  3. In order to stay healthy, it is a good idea ______ your doctor at least once a year.

In order to stay healthy, it is a good idea ______ your doctor at least once a year.

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问题 In order to stay healthy, it is a good idea ______ your doctor at least once a year.
选项 A、visits
B、to visit
C、that visits
D、visited
答案B
解析 为了保持身体健康，每年至少到你的医生那里去检查一次是一个不错的主意。it 在句中作形式主语，动词不定式短语to visit your doctor at least once a year是句中的真正主语。
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