A.could not pass | B.could not have passed |
C.did not pass | D.could not passed |
A.can’t have been | B.mustn’t have been |
C.must be | D.may be |
A.begin | B.begun | C.have begun | D.began |
A.shall | B.will | C.ought to | D.need |
A.am able; couldn’t | B.could; was able to |
C.was quite able to; couldn’t | D.couldn’t was able to |
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