Every possible means _______ to prevent the crash , but the computer doesn’t still work．
#4644
A
is used
B
are used
C
has been used
D
have been used
推荐题目
Wouldn’t it be for you to pick me up at four o’clock and take me to the airport.
#4931
A
free
B
vacant
C
handy
D
convenient
In1994, China began collecting income tax from citizens earning more than 800 Yuan per month but only 1% people were earning more than _______; now about 60% earn the amount.
#5000
A
this
B
these
C
those
D
that
Luckily, Smith brought a map, __________ we would have got lost.
#4527
A
that
B
of which
C
without which
D
which
It was a pity that the great writer died _________his works unfinished.
#4904
A
for
B
with
C
from
D
of