Question

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

Answer 1

答案是A
April 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that
C, 语法上正确，但是一般用了现代进行时，后面是不加具体日期的，所以A更正确。
D 的话，to be celebrated,“即将被庆祝”，含义是过去和现在都没有，不正确。

Answer 2

选A
April Fool's Day is a tradition是主句，celebrated by many countries around the world on the first of april是以非谓语形式来修饰tradition的

Answer 3

选A吧。这是个约定俗成的东西，所以一般时态就好。

Answer 4

C。being done 表示一直以来被世界各国庆祝的传统节日

Answer 5

选A。。。过去分词表被动...做后置定语...

Answer 6

答案选
A