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--- A new baby came to the earth ______ a sunny winter morning.

--- How nice.

A. in                     B. on                        C. of                D. at

--- A new baby came to the earth ________ a sunny winter morning.     

--- How nice.

A. on          B. in        C. of            D. at

— A new baby came to the earth ______ a sunny winter morning.

— How nice.

— A new baby came to the earth ______ a sunny winter morning．

— How nice．

A． in          B． on          C． of          D． at