---______ Sunday morning, they are going to get up early .
---That’s good , but I’m going to stay in bed ______ the morning.A.On , onB.In, inC.In , onD.On, in
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D解析考介词，在"星期天的早晨"、"在星期天"，都应该用on,例on Monday/Sunday;在早晨 就用 in，例in the morning/afternoon/evening