_贵阳成考网

What have scientists achieved in dealing with floods?

• A、They have prevented many rivers from flooding.

• B、They have reduced the damage caused by floods.

• C、They have learned much about conditions for flooding.

• D、They have found most of the ice damson the river.

I asked him to goto the art exhibition， but he said he had_____ seen it.

• A、still

• B、already

• C、also

• D、often

55.