It must have been after two o'clock in the morning when the last guests【B1】their leave, an
【B1】
A.asked
B.took
C.got
D.waited
【B1】
A.asked
B.took
C.got
D.waited
Ocean exploration is not so expensive as space travel mainly because ______.
A.it is not affected Earth's gravity
B.most undersea vehicles operate at the end of long ropes
C.ROVs have been put to use
D.there is no need for submersibles to get away from Earth' s gravity
What must have happened to the writer in the end?
A.He must have spent a long time at the customs and must have been let go without any punishment.
B.He must have been given a fine as a punishment.
C.His Rolex must have been confiscated.
D.His cheap watch must have been confiscated.
She must have been pretty______to fall for such an old trick.
A.interested
B.shrewd
C.enthusiastic
D.gullible
A、must have
B、ought to be
C、should have been
D、could have been
What must have happened to the writer in the end?
A.He must have spent a long time at the customs and must have been let go without any punishment.
B.He must have been given a fine as a punishment.
C.His Rolex must have been confiscated.
D.His cheap watch must have been confiscated.
Such a proposal must have been put forward by people with limited______.
A.outlook
B.overlook
C.outline
D.overview
A.A. must be
B.B. should be
C.C. must have been
D.D. should have been
A.must have
B.must have had
C.must have been
He must have had an accident, or he______here then.
A.should be
B.would be
C.could have been
D.would have been
A.hostile
B.anxious
C.tedious
D.obscure
Look, what you have done! You ______ must have been move careful.
A.must
B.might
C.should
D.would
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