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

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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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