Early the morning of May 1 we started out the mountain village.A. in;forB. in;toC. on;inD

问题补充：

Early the morning of May 1,we started out the mountain village.

A. in;for

B. in;to

C. on;in

D. on;for

答案：

A. in;for

B. in;to

C. on;in

(答案→)D. on;for

解析：在具体某一天的上午（下午或者晚上）时,用介词on；start out for 意为“向某地出发”,for表示方向。