The man has been in____ doctors describe as a vegetative （植物的） state for six years．
| A．what | B．which | C．that | D．how |
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A computer_____think for itself, it must be told what to do.
| A．can’t | B．couldn’t | C．may not | D．might not |
—What were you doing when Tony phoned you?
—I had just finished my work and ___ to take a shower.
| A．had started | B．started | C．have started | D．was starting |
—You were out when I dropped in at your house.
—Oh, I_______ for a friend from England at the airport.
| A．was waiting | B．had waited | C．am waiting | D．have waited |
—Do you think we should accept that offer? 
—Yes，we should，for we______ such bad luck up till now，and time______ out.
| A．have had；is running | B．had；is running |
C．have；has been run | D．have had；has been run |
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