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【题目】My mother is used to getting up ________ 5:30 a.m.

A.inB.atC.on

【答案】B

【解析】

句意:我妈妈习惯早上五点半起床。

考查介词。in表示年、月、季节或泛指上午、下午、晚上;at用于表示某一具体时刻或时间点;on指具体的某一天或某天的上午、下午、晚上; 根据“5:30 a.m”可知,这是具体的时刻,因此用介词at。故选B

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