All his attempts to unlock the door were , because he was using the wrong key.
#27426
A
in return
B
in vain
C
in doubt
D
in time
推荐题目
_____ the moonlight they cooked the meat _____ an open fire.
#28297
A
To; over
B
From; in
C
In; near
D
By; on
After the earthquake，the injured were cared______in the hospitals or taken by air to the hospitals in the neighbouring cities.
#28731
A
of
B
for
C
after
D
with
Reciting does much good in language learning and it _____helps to learn science subjects better.
#25814
A
on the contrary
B
in turn
C
by chance
D
in return