Astronauts have already been to the moon.改成疑问句:Where have astronauts( )been选填

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• Astronauts have already been to the moon.改成疑问句:Where have astronauts( )been选填already或yet
• Astronauts have already been to the moon.改成疑问句:Where have astronauts( )been选填
• 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 spacecraft has reached Mars.(just)
• 用has/have been或has/have gone填空：（有缩写,请见谅） She ____ to the cinema this evening.She ____ to the cinema this evening.She ____ already ____ to the cinema three times this week.I ____ not ____ to the market today.I saw you in Annabel's Restaurant last night. I ____ never ____ there.Sally and Tim are on holiday,aren't they? Where ____ they ____?How many times _____ they _____ there?Astronauts _____ to the moon and returned safely,
• I ____ to the school cafeteria.A.have just gone B.just go C.have just been D.just have been
• a^4b^2+a^2b^2+b^2因式分解