英语语法填空有些不懂.求详解

题目

英语语法填空有些不懂.求详解
1.In the 200 meters competition he set a new world record of 21.30 seconds in his heat on 29 Auaust,___but__was defeated in the final by Alan Oliveira of Brazil and took silver.(为什么这里用but,不用which?求详解)
2.He ran in the second semi-final,__where__he finshed eightth with a time of 46.54 seconds.(为什么这里用where,不用that?求详解)
3.They both fell to the ground ___unconscious____(conscious)(为什么这里不用unconsciously,而用unconscious,不应该副词修饰动词吗?求详解)

答案

1、从语法上将which（最好是who）也对,但是通读句子,他所强调的是一种转折关系!
2、此题定语部分不缺成分,而that在定语成分做主语或宾语,where表地点状语,
This is the school which I visited last year.(visit the chool,visit 后直接接宾语）
This is the school where I studied last year.( study in the school,in the school是地点状语）
此处,where代指in the second semi-final
3、如果选unconscious,则译为“他们跌到地上,摔得不省人事”
如果选unconsciously,则译为“他们无意的跌倒在地上”