【題目】My mother is used to running ______ the morning, so she's very healthy.
A.on
B.in
C.at

【答案】B
【解析】句意：媽媽習(xí)慣于在早晨跑步，所以她很健康。根據(jù)時間“___the morning”可知這是泛指每一天的早晨，沒有具體到某一天的早晨，所以用介詞in．a(chǎn)t+時間點; on+具體的某一天或某一天的早中晚。故選B。

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