"Martin was taking pictures of wild animals. "" Oh. no. He ____ killed ."
A. might be
B. might have been
Professor Wang ______ be in Beijing because I saw him in the library only a few minutes ago.
A. must not be
B. can't
C. may not
D. should not
" I know she was in because I heard her radio. but she didn't open the door.""She_______ the bell . "
A. mustn't have heard
B. may not have heard
C. needn't have heard
D. can't have heard
I can't find Mrs. Fox in her office; she____ for home.
A. might have started
B. might start
C. may be starting
D. may start