|
A. prepared | B. was preparing | C. has been preparing | D. has prepared |
A. gave out | B. gave off | C. gave in | D. gave up |
A.set about | B.set aside | C.set up | D.set off |
A.discovered | B.have discovered |
C.had been discovered | D.have been discovered |
A.exchange for | B.exchange | C.in exchange for | D.to exchange for |
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