Many things now cost double what did a year ago.请问这里的what起什么

what did mary have many years ago?翻译这句话, 请问 At what time of year did Ken visit paris?这里去掉at 意思一样吗 请老师 请问many people did not travel years ago此句正确吗,是什么翻译,year ago前是 Many things seemed ( ) a hundreds years ago,but now they've the production is now three times what it was ten year ago 其 Do you know ____just now?A.what he did B.What did he do C wh what other things did you do 的另一种英语解释? 请问选择什么时态,为什么?--What _________ she ___ (do) a moment ago? what was Shanghai like many yeas ago What did you say( )(change)his mind just now?这里为什么填to change what did Benny do just now?的意思是什么 原句It costs double what it did before.