问题描述：
Jane needn't get up early ______ every Sunday morning. A. in B. on C.at D. /
A. in B. on C. at D. /
选哪个,请说明原因.谢谢!
A. in B. on C. at D. /
选哪个,请说明原因.谢谢!
问题解答：
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