While listening carefully, the students______ what their teacher said. 
#12554
A
set down
B
turned down
C
got down
D
calmed down
推荐题目
. --- Do you have any trouble explaining the sentence?         ---No, _____
#12636
A
nothing at all
B
a little
C
none at all
D
not at all
Once air pollution       in most cities, it is hard      .
#13397
A
rises; dealing with
B
arouses; to be dealt with
C
raises; dealt with
D
arises; to deal with