The best way to prevent the air polluting _____ , but the sky is still not clear.
#102116
A
is used
B
are used
C
has been used
D
have been used
推荐题目
–Smoking is bad for your health. --Yes, I know. But I can’t _____.
#101241
A
give it in
B
give it up
C
give it out
D
give it away
Up to now, they _______enough money for students who can’t afford to go to school.
#101076
A
are raising
B
have been raising
C
have raised
D
had raised
She was surprised to find the fridge empty; the child _________ everything!
#100078
A
hadbeeneating
B
hadeaten
C
haveeaten
D
havebeeneating
Every year, the coal workers their lungs X-rayed to ensure their health.
#101931
A
are having
B
have had
C
have
D
had had
Have you nearly finished? Time_______.
#102536
A
is run out
B
has been run out
C
is running out
D
has run out of