No one knows when the wheel is invented. 没有人知道轮子是什么时候发明的。当主句谓语动词（knows)用现在时, 宾语从句可以用各种时态。本句可用过去时（was），也可以用现在时（is）。用过去式was invented,强调问过去仁时刻发明的。用现在式is invented, 仅仅问"轮子发明"，而不问具体的时候。
There have been many great inventions or things that changed the way we live. The first great invention was the one that is still very important today—the wheel(轮子). This made it easier to carry heavy things and to travel long distance. For hundreds of years after that there were few...
探究点一inventv.发明IthinktheTVwasinventedafterthecar.我认为电视是在汽车之后被发明的。Unit6Whenwasitinvented第1课时SectionA(1a-2d)点睛beinvented是invent的被动语态结构,意为“被发明”。常用结构有:beinventedin...被发明于……;beinventedby...由……发明。TheelectriclightbulbwasinventedbyEdison.爱迪生...
A pen.Though it is small, the pen has changed the history, improved the trade of countries, recorded events, carried news, and done far more work for human beings than all other tools.Progress without it would have been almost impossible. The invention of the wheel, the introduction of ...
When was beer invented? When was the first water wheel invented? When was the electric lamp invented? When was the mechanical computer invented? When were roller skates invented? When was the spaceship invented? When was the ferry invented?
1Wheels are everywhere around you and me, yet no one knows exactly when the first wheel was invented o what it was used for. We do know, however, that they existed over 5.500 years ago in ancient Asia The oldest known transport wheel was discovered in 2002 in Sloveni a It is over 5...
2020年人教版新目标英语九年级上册《Unit6Whenwasitinvented？》达标测试卷及答案 UNIT 6达标测试卷 时间：120分钟满分：150分 第一卷听力部分(30分)一、关键词语选择(共5小题；每小题1分，满分5分)1. A. bridge B. fridge C. village 2. A. sweet B. salty C. sour 3. A. candy B...
I was born (in/ on/ at) 2001. I finished my homework (before/ after) dinner. 2. 教师可以让学生在小组内进行交流,以发明物品为话题,讨论并总结出不同发明物品的时间,同时,运用所学的表示时间的介词和连词进行回答。 例如: A:When was the airplane invented? B:The airplane was invented (in) 1903...
根据" a new wheel was i (3)___ in California. "因此可知一种新的轮子在加利福尼亚被发明出来了。前面是was,所以要用过去分词invented来填空,构成一般过去时的被动语态。故填invented.(4)with.考查介词。根据"A skateboard (4)___these wheels moved very (5)___(迅速) "因此可知具有这些轮子的滑板...
When was the first wheel invented? When was the first washing machine invented? When was the first race car invented? When was the first commercial airplane invented? When was the external combustion engine invented? When was the gas stove invented?