Every possible means ___ to prevent the air pollution, but the sky is still not clear．
#101596
A
is used
B
are used
C
has been used
D
have been used
推荐题目
I wish that the elderly would live in comfort without worry or health problems in the years they have ．
#102227
A
left
B
leaving
C
to leave
D
being left
Sorry, these two tables are already ______. You may book the one over there.
#103484
A
preserved
B
deserved
C
observed
D
reserved
25．----Why don’t we choose that road to save time? ----The bridge to it _________.
#103887
A
has repaired
B
is repaired
C
is being repaired
D
will be repaired
—Why do you look so puzzled?—Oh，I ________ over a most difficult maths problem.
#99720
A
thought
B
have thought
C
am thinking
D
think
To _____ his position in the country, he appointed his close friend Henry as head of the troops.
#101227
A
strengthen
B
sponsor
C
clarify
D
switch