When he was in the countryside, he ______ visit the poor peasants.

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问题 When he was in the countryside, he ______ visit the poor peasants.

选项 A、used to
B、was used to
C、is used to
D、had used to

答案A

解析 used to do意为“过去常常”。be used to doing意为“习惯于干某事”。
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