题目内容：

April Fool's Day is a tradition____by many countries around the world on the first of april.
A celebrated
B is celebrated
C being celebrated
D to be celebrated

优质解答

答案是AApril Fool's Day is a tradition celebrated by many countries around the world on the first of April.B,如果有is,要说 "a tradition that is celebrated" 才对,缺了thatC,语法上正确,但是一般用了现代进...