Horses and oxen have been ________ to work on farms.
举一反三
- All of the plants now raised on farms have been developed from the plants _____ wild. ( )
- (All of) the plants now (raised) on farms (have been) developed from plants (once grew) wild. A: All of B: raised C: have been D: once grew
- ______ so many people put of work as today. A: Before have never there been B: There have been never before C: Never before have there been D: Have there never before been
- He told me that by the end of this month ______ in this company for 10 years. A: will have been working B: would have been working C: will work D: would work
- By the end of this month he _______________ horses for 20 years. A: trained B: will train C: is training D: will have been training