单项选择题

If the whole program ______ beforehand, a great deal of time and money would have been lost.

A．was not planned
B．were not planned
C．would not be planned
D．had not been planned

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单项选择题（2）处应填写（）

A．detail
B．advance
C．time
D．mind

单项选择题Some scientists think there may have been life on the Mars in the past because （）.

A．there is no life there now
B．there is a large amount of water at the poles
C．the Mars may be able to support life in the future
D．conditions may have been similar to those on the Earth