Computers in offices and homes since 1970s．
| A．have been used | B．had been used | C．was | D．has been used |
The young girl sitting next to me on the plane was very nervous.She ______before.
| A．hasn’t flown | B．didn’t fly | C．hadn’t flown | D．wasn’t flying |
. –Is there anything wrong , Bob ? You look sad .
--Oh, nothing much. In fact ,I _____of my friends back home .
| A．have just thought | B．was just thinking | C．would just think | D．will just be thingking |
-- Did you see a man in black pass by just now ?
--No , sir. I _____a newspaper .
| A．read | B．was reading | C．would read | D．am reading |
Danny _____ hard for long to realize his dream and now he is popular.
| A．works | B．is working | C．has worked | D．worked |
26.—Did Peter fix the computer himself ?
--He ____ ,because he doesn’t know much about computers.
| A．has if fixed | B．had fixed it | C．had it fixed | D．fixed it |