July 1,1997 is a special date for all Hong kong people,____,I thi_英语解答

July 1,1997 is a special date for all Hong kong people,____,I think,they will remember foever.
A.one B.that C.it D.when 请问此题的最佳答案是什么?为什么?

人气：498 ℃　时间：2020-07-23 03:54:11

解答

真是纠结~
when 指代前面的日期~
怎么就没有which选项呢~
想选that,但貌似不能用逗号隔开么~