单选题 When he was in the countryside, he ______ visit the poor peasants.
[A] used to [B] was used to
[C] is used to [D] had used to

【正确答案】 A

【答案解析】[解析] 本题考查固定搭配。used to do意为“过去常常”。be used to doing意为“习惯于干某事”。