Although there is no life on Mars now , some scientists think that there some form of life a long time ago .
| A．must be | B．may have been | C．can have been | D．could be |
相关试题
---- Can you hand in your composition tomorrow?
---- Sure. ______ it handed in on time, I’ll stay up tonight.
| A．To have got | B．To get | C．Getting | D．Having got |
It is human nature to think back to a golden age ______ one’s country was strong and respected.
| A．if | B．when | C．while | D．after |
The young man, ______ several attempts to beat the world record in high jumping, decided to have another try.
| A．to make | B．making | C．made | D．having made |
---- Are you
still very busy?
---- Yes, I ______ the report for the manager and it won’t take long.
| A．have just finished | B．am just finishing |
| C．had just finished | D．am just going to finish |
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