"The lecturer was a tall thin man with white hair." "Then it _______Dr.Fell because h
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"The lecturer was a tall thin man with white hair." "Then it _______Dr.Fell because he is short and fat.It_____Dr.Jones;he is thin."
A. can't be/must be
B. mightn't have been/could have been
C. must be/can't be
D. can't have been/must have been
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