A. pioneer
B. prior
C. premature
D. past
The manufacturers _____ carried out one of the Chairman's proposals, but they didn't.A.must haveB.couldn't haveC.ought to haveD.shouldn't have
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I_______ have watched that movie —it’ll give me horrible dreams.A. shouldn’tB. needn’tC. couldn’tD. mustn’t
He is an honest man and he will keep his _________.A.appointmentB.dateC.promiseD.engagement
--Your phone number again? I _______ quite catch it.A.don'tB.can'tC.couldn'tD.didn't
“Must I return the book to the library in a week?”“No, you.”()A. couldn’tB. mustn’tC. needn’tD. won’t
49________.A.couldn’tB.mustn’tC.needn’tD.won’t
To order tickets for 20080lympic Games,just call 952008.It__________be simpler.A.must B.could C.mustn’t D.couldn,t