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(3分)The two astronauts will do   (研究) in space.

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Recently, two American astronauts have landed on Mars.  The surface of Mars is very hot.  The journey to the moon started the future exploration in space.  There is life in Venus.  
when; which    which; when    what; that    on which; when  
tired and happy   tired but happy   tiredly and happily   tiredly but happily  
when; which    which; when    what; that    on which; when  
不填;不填    the; the    a; the    不填;the  
has gone    have been    has been    have gone  
were sent   sent   have been sent   have sent  
a; the    the; 不填    the; the    a; 不填  
considered   had considered    was considered    were considered  
when; which    which; when    what; that    on which; when  
were sent    sent    have been sent    have sent  
a; the    the; 不填    the; the    a; 不填  

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