Some aspects of a pilot's job be boring, and pilots often work at inconvenient hours．
#63217
A
can ; have to
B
may ; can
C
have to; may
D
ought to; must
推荐题目
—These grapes look really beautiful. —They _______! See the price $3.99 a pound. Very expensive, aren’t they!
#62527
A
might
B
could
C
would
D
should
— Can I go to the movie, Mum?— Certainly. But you _______ be back by ten o’clock.
#76644
A
can
B
may
C
might
D
must
.--- Where is your father? --- I'm not sure. He_______ in the office.
#75019
A
must be
B
maybe
C
may be
D
perhaps
——Who’s the man over there?Is it Mr. Black?——It______be him. He’s much taller.
#75454
A
may not
B
can’t
C
will not
D
mustn’t