难度：★★     考点：时态语态

　　71．--Would you please not draw pictures on the wall？

　　----Sorry. I ____ it again.

　　A．am not doing

　　B．don't do

　　C．didn't do

　　D．won't do

　　72．How long ____ at this factory？

　　A．have you come

　　B．has he in

　　C．will he be

　　D．has he been to

　　73．--Do you know when he ____ back tomorrow？

　　----Sorry, I don't. When he ____ back. I'll tell you.

　　A．comes； comes

　　B．come s； will come

　　C．will come； comes

　　D．will come； will come

　　74．I don't know when he ____ .When he ____ ， I'll let you know.

　　A．comes； comes

　　B．will come； comes

　　C．comes； will come

　　75．We ____ English for three years already. And we can speak a little English now.

　　A．learn

　　B．have learned

　　C．has learned

　　D．will learned

　　76．My grandpa died six months ago， that is to say，  he ____ for half a year.

　　A．has been dead

　　B．died

　　C．was dead

　　D．has died

　　77．Our workshop ____ since two years gao.

　　A．was open

　　B．opened

　　C．has been open

　　D．has opened

　　78．John ____ the factory since 1984. He's one of the oldest workers here now.

　　A．came to

　　B．comes to

　　C．has been in

　　D．has come to

　　79．Mrs Black is a worker of No. 1 Machine Factory. She ____ there since it opened in 1958.

　　A．worked

　　B．works

　　C．has worked

　　D．is working

　　80．His hair ____ white these days.

　　A．be

　　B．are

　　C．has turned

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