问题补充：
They went fishing a sunny morning.
A. on
B. in
C. at
D. to
答案：
(答案→)A. on
B. in
C. at
D. to
解析：在具体一天的早上、下午、晚上，都用介词on，故选A
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时间：2018-11-22 16:57:48
They went fishing a sunny morning.
A. on
B. in
C. at
D. to
(答案→)A. on
B. in
C. at
D. to
解析：在具体一天的早上、下午、晚上，都用介词on，故选A
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