和現(xiàn)在有關(guān)的用have
和現(xiàn)在無關(guān)的用had
過去發(fā)現(xiàn)的物質(zhì)對現(xiàn)在有影響,所以用have
With the help of high technology,more and more new substances[ ]in the past years.
With the help of high technology,more and more new substances[ ]in the past years.
空中應(yīng)填have been discovered而不是 had been discovered,為什么
空中應(yīng)填have been discovered而不是 had been discovered,為什么
英語人氣：511 ℃時間：2019-12-14 14:05:27
優(yōu)質(zhì)解答
我來回答
類似推薦
- With the development of economy,more and more high technology and science rushing into big cities.
- With the development of science,more and more new technology_____to the fields of IT
- With the development of science,more new technology ______ to the field of information technology
- With the help of the Project Hope,more and more new schools____in the poor areas.
- with the development of science more new technology
- 計算：（1）（2x²－3x+1）（2x²+3x-1） （2）（a－2b+3c）²
- ok.This cup of tea is for you.
- 在一個比例中,兩個內(nèi)項的積是最小的質(zhì)數(shù),已知一個外項是二分之一,另一個外項是?
- be careful,persist,a mistake i will never repeat
- 多少天?
- stl 里面的lower bound 程序里這句：half = len >> 1 >> 表示什么?
- 請問The day you want away
猜你喜歡
- 1六年級上冊第八作文
- 2一個數(shù)既是36的因數(shù),又是2的倍數(shù),這樣的數(shù)是( )
- 3唐詩宋詞元曲和現(xiàn)代詩300首哪里有?
- 4已知x,y滿足x-y+5>=0,x+y>=0,x
- 5小玲沿某公路以每小時4千米速度步行上學(xué)，沿途發(fā)現(xiàn)每隔9分鐘有一輛公共汽車從后面超過她，每隔7分鐘遇到一輛迎面而來的公共汽車，若汽車發(fā)車的間隔時間相同，而且汽車的速度相同，
- 615公分的灰土兩步 請問一步灰土 用白灰?guī)坠謣
- 7英語翻譯
- 8小剛的書是小亮的2倍,如果小剛給小亮6本書的話他們兩的書的數(shù)量就一樣多,問小剛和小亮各有幾本書?
- 9調(diào)查問卷的回收率怎么算
- 10若不等式組x-m≥o,3-2x＞-1有3個整數(shù)解,m的取值范圍是
- 11There are many students playing games on the playground 改為同義句
- 12請問能告訴我一下每立方米瀝青混凝土,石子的用量么