问题
单项选择题
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
答案
参考答案：A
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。
