I am not sure .
#35720
A
always
B
still
C
never
D
yet
推荐题目
The cleaners must prevent the street _____.
#38226
A
from getting dirty
B
to dirty
C
to get dirty
D
getting dirty
They took rock samples back to Earth for _____study.
#42229
A
farther
B
step by step
C
further
D
far away
--- Did you see My Love from the Star ( 《来自星星的你》)? --- Yes. I ____ it twice so far.
#40002
A
see
B
am watching
C
saw
D
have seen
Some students are doing their homework in the classroom while ______ are reading.
#38596
A
another
B
the other
C
other
D
others