Big Ben is one of the first sights you will see when you___London

问题描述:

Big Ben is one of the first sights you will see when you___London
1 will visit 2 visit 3 have visited 4 will be visiting
请问选择哪一个,及分别说出每个为什么对与错,

选2.前面有you will see.will表将来,when引导的时间状语从句,遵从“主将从现”(主句将来时,从句现在时)原则.只有2符合.