this was the third time they()china.为什么括号中填had visited,this+

this was the third time they()china.为什么括号中填had visited,this+ This was the first time they visit还是visited Chengdu [单选题]1.It was the third time _____ he had done this experime This is they first visited to the Great Wall.中,visited后为什么加t 1.This is the third time this week he's had to study late,_? it was the third time i was late this week.it was 后面什么用法? Is this the university_________you visited last time? This is the second time that these Japanese had visited Shan Is this museum ( )they visited last month?填 the one ,填 what this is the third time that they have g____ for a discussion It(This) is/was the first(second,third……) time that sb.have/ Is this museum the one they visited last month?为什么是the one而不