题干
The sportsmeeting had to be put off ________ the thick fog.
A：due for
B：on account of
C：because
D：owing
答案(点此获取答案解析）
B
The sportsmeeting had to be put off ________ the thick fog.
A：due for
B：on account of
C：because
D：owing
，那么下列等式一定成立的是（ ）