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

A.inB.atC.on

【答案】B

【解析】

句意:我媽媽習慣早上五點半起床。

考查介詞。in表示年、月、季節(jié)或泛指上午、下午、晚上;at用于表示某一具體時刻或時間點;on指具體的某一天或某天的上午、下午、晚上; 根據(jù)“5:30 a.m”可知,這是具體的時刻,因此用介詞at。故選B。

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