.The accident is reported to have occurred _______ the first Sunday in February.选一个答案

.The accident is reported to have occurred _______ the first Sunday in February.选一个答案
.The accident is reported to have occurred _______ the first Sunday in February.
选一个答案

.The accident is reported to have occurred _______ the first Sunday in February.选一个答案
填介词on,
在具体的某一天(某日）前用on.在某年,某月,某季节前用in.