All possible means ____ to prevent the air pollution, but the sky is still not clear.
#100326
A
is used
B
has been used
C
are use
D
have been used
推荐题目
— What’s that terrible noise ?— The neighbors _____ for a party.
#105005
A
have prepared
B
are preparing
C
prepare
D
will prepare
.—I’ve got to go now.—Must you ?I ______you could stay for dinner with us.
#104852
A
think
B
thought
C
have thought
D
am thinking
Jack as well as the other students who ______ sent abroad by the government ______ brought up in a small town.
#102269
A
were/was
B
was /was
C
was / were
D
were/were
--- You seem to be familiar with London.--- I ______ there for three years. It’s great to be back.
#99805
A
lived
B
had lived
C
have lived
D
live
Not only ____ the jewelry she ____ been sold for her son's gambling debts but also her house．
#104220
A
is；has
B
has；had
C
has；has
D
／；has