Do you know _______ World Water Day is?-On March 22ndA.when B.whe_英语解答

Do you know _______ World Water Day is?-On March 22nd
A.when B.where C.what D.which 为啥是when,他不是做时间状语嘛（不做句子成分的吧）?可是is后面缺一个表语啊,

人气：272 ℃　时间：2020-05-23 17:15:15

解答

从答句可以看出,on the march 22nd,这是时间状语,所以就是when ,该句中,when = on which day