The astronauts have _____ to the space station twiceA.gone B.been C.went D.be 说明原因

Astronauts have already been to the moon.改成疑问句:Where have astronauts( )been选填already或yet 高中英语的完成句子-In space the astronauts will have to face the circumstances_on the earth . Have the scientists_____ spoken to the astronauts?A.already B.just C.ever D.yet astronauts 现在完成时 同义句区别I have never visited the USA I never visit the USA 有什么区别 Astronauts have already been to the moon.Astronauts have been to the moon.有什么区别 The astronauts have _____ to the space station twiceA.gone B.been C.went D.be 说明原因 Put the words in the correct place in each sentence.例句：Astronauts have been to the moon.(already) Astronauts have already been to the moon. 1.They haven't been to Mars.(yet) 2.Many astronauts have visited the space station.(already) 3.The space 宇航员的妻子 THE ASTRONAUTS WIFE怎么样 Losts of astronauts ___to the space station . They found it very interesting.答案：A：have been B:have gone___中选一个答案 Lots of astronauts ________(has/have) been to the space station .They found it very interesting.why?请说明，has和have有什么区别？ More Chinese astronauts _____________ into space with the development of science and technology.A) have been sent B) will be sent C) have sent D) will send Put the words in the correct place in each sentence.例：Astronauts have been to the the moon(already)Astronauts have already been to the the moon.1.They haven't been to Mars.(yet)2.Many asteonauts have visited the space station.(already)3.The space Space travel is dangerous and the astronauts in space have to ______ many discomforts (不适) in their rockets.选项:a、disturb b、 tremble c、 endure d、 operate the moon which the American astronauts have found to be without life or vegetation.The earth is,however,very different from the moon,which the American astronauts have found to be without life or vegetation.句中的关系代词which是不是应该 英语翻译Because of the unbelievably vast distances of space,astronauts have only been able to concentrate on the part of space immediately surrounding the earth; satellites and nmanned space shuttles have been launched to explore the rest of the 英语翻译_____ _____ the astronauts can see the Earth clearly. Complete the sentences with the correct form the words and phrases in the box.borrow discover life model recently space station space shuttle1.Astronauts take the _____to get to the_____2.they have not___ any_____on mars yet3.the____of the space stat In memory of the Challenger astronauts 音频或视频