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[主观题]
A.at firstB.at allC.at largeD.at times
A.at first
B.at all
C.at large
D.at times
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A.at first
B.at all
C.at large
D.at times
_17_ the professor stopped
A.At first
B.At last
C.At once
D.At least
A.At the moment
B.Now and then
C.So far
D.By far
A.at the top of
B.on the part of
C.at the foot of
D.on the ground of
A.At a museum.
B.In a store.
C.In a classroom.
D.In a library.
A.At a railway station.
B.On a flight.
C.In a hospital.
D.In a reading-room.
With regular means of learning, the learners have to study_________ .
A.at school
B.on their own
C.at all hours of the day
D.by means of reading and writing
A.At all times
B.All the while
C.At all time
D.Once in a while
A.at
B.to
C.of
D.for