I’ve heard that we will set out _________ the morning of Dec 25th .
A. at B. in C. on D. over
I’ve heard that we will set out _________ the morning of Dec 25th .
A. at B. in C. on D. over
C
本题句意“我听说我们将在十二月25日早晨出发”。在特定的某日的早晨、中午或晚上，介词用on。