難度：★★ 考點：時態語態
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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