— Listen! Helen is singing in the classroom.—It _______ be Helen. She has gone to Shanghai.
#74428
A
mustn’t
B
may not
C
can’t
D
should
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---Are you content with her lecture? ----Far from that. It _______.
#63457
A
may have been good
B
couldn’t have been worse
C
can’t be better
D
must be better
It_____ years ago when the incident took place, and I nearly forget it.
#62663
A
would have been
B
should have been
C
ought to have been
D
must have been