Every possible means ______ to prevent the air pollution, but the sky is still not clear.
#86302
A
is used
B
are used
C
has been used
D
have been used
推荐题目
______visited the Shanghai World Expo is sure to tell you the place is worth visiting twice.
#85638
A
Those who have
B
Whoever has
C
Those who has
D
Whoever have
—Where _____ your food?—I only have two hamburgers. They ____ on the table.
#43963
A
is; is
B
is; are
C
are; is
D
are; are
Either you or one of your students ________ to attend the meeting that is due tomorrow.
#85908
A
were
B
is
C
are
D
be