A. mustn’t have written B. couldn’t have written
C. needn’t have written D. might not as well have written
A. have worked B. have been working C. be working D. work on
A. for becoming B. to become C. of becoming D. becoming
A. Until B. Before C. Unless D. If only
A. as B. while C. after D. since
A. none but B. none other than C. nothing but D. no other than
A. needn’t have seen B. might have seen C. must have seen D. can’t have seen
A. must send B. send C. are to send D. need send
A. looking for B. to look for C. having looked for D. looked for
A. to support B. for supporting C. supporting D. of supporting
A. has given B. was given C. being given D. has been given
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