—Excuse me, whose Japanese book is this?
—It ________ be Tom's. In our class, only he is studying Japanese.
A.must B.can’t
C.would
—Excuse me, whose Japanese book is this?
—It ________ be Tom's. In our class, only he is studying Japanese.
A.must B.can’t
C.would
A 点拨:依题意知表肯定的推测,用must。