---What are you busy with ?--- We are carrying out a research ____ the causes of cancer.
#27580
A
into
B
onto
C
to
D
in
推荐题目
--How soon will Henry be back?—He said he would come home ___ four o’clock.
#28196
A
after
B
in
C
about
D
for
Although the old man was ______ death, he still fought with the disease bravely.
#25436
A
at the end of
B
on the top of
C
at the edge of
D
on condition that
The large grassland, reaching out far away, looks extremely beautiful ____the blue and clean sky．
#28159
A
with
B
against
C
through
D
Beyond
It’s me why some people are crazy about iPhone. It’s just a means of communication.
#25640
A
above
B
under
C
beyond
D
over