Question

the book ()be john's. it has his name on it.

( ) 3. The book Toms. It has his name on it. A. must be B. may be C. can't be D. can be

Answer 1

3. A must be指把握性强的肯定猜测，can be和may be指把握性不大的肯定猜测，can't be指否定猜测。书上有Tom的名字，说明一定是Tom的，故选A.