It’s reported that a plane with five people crashed into the mountain several days ago.
A. on board
B. on the board
C. in board
D. in the board
网友回答
(答案→)A. on board
B. on the board
C. in board
D. in the board
解析：on board意为“在船上、在飞机上”，为固定的介词短语。没有B、C、D这样的搭配。