The Present Perfect after Time Conjunctions
313 [75] 1. What will it be necessary for astronauts to do in future flights to distant planets? 2. When shall we know whether the astronaut in the spaceship "Astra" has succeeded in his attempt to do this? 3. When is a message expected? When will the results of the trip be announced? ( ... and ... . )
CLUES >> at seven o'clock this evening / descend from a spaceship while it is still in space / immediately / we have received a radio message
313 [75]
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[ DATED ] 313 - In future flights to distant planets, it will be necessary for astronauts to descend from a spaceship while it is still in space. We shall know whether the astronaut in the spaceship Astra has succeeded in his attempt to do this when we have received a radio message. A message is expected at seven o'clock this evening and the results of the trip will be announced immediately.
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