the year in which Britain was to lead the world in making poverty history为什么用WAS TO LEAD?这里是什么语法现象?帮我解释下,这个语法结构,关键是突然出来个WAS,不是很能理解这个结构.为什么是WAS TO LEAD呢？

This year which team will win in the world cup? Which is your favorite festival in the year?翻译 Which is your favourtite day in the year.对还是Which is your favourtite day in a year对 连词成句:season in is which the year the warmest..Which is the warmest season in the year?和which season is the warmest in the year 两上都对吗?为什么? -Is this the place ____ you visited last year?( ) --when --which --where --in which Which seasons is the ______(cold) in a year and which is the________(hot)? That's the Science Museum __we visited last year.A where B which C to which D in which That's the Science Museum __we visited last year.A where B which C to which D in which This is the Museum()we paid a visit last year A.where B.which C.in which D.to which Is this school ____we visited last year?A.which B.in which C.the one D.at which 5. This is the museum______ we visited last year. A. where B. in which C. which D. in that5. This is the museum______ we visited last year. A. where B. in which C. which D. in that what happened in the year of 1066 which had an effect on the english language? which season is the w____ in the year,Tara?-----Summer.填什么? by which year 和in which year___year will the world's population reach 6 billion.A by which B in which The English play ( ) my students acted at the New Year's party was a great success.A.for which B.at which C.in which D.on which A:Which month has____days in a year?B:February 求A:Which month has____days in a year?B:February求:为什么横线上填 The fewest This is the house in which we lived last year This is the house that we lived in last year This is the house which we lived in last year in the coming year