－Why does the river smell terrible?－Because large quantities of water______．
#100039
A
have been polluted
B
is being polluted
C
has been polluted
D
have polluted
推荐题目
He__________ he would be able to leave tomorrow, but it's beginning to take difficult.
#104305
A
hopes
B
was hoping
C
had hoped
D
hoped
－Have you known Dr Jackson for a long time?－Yes，since she the Chinese Society．
#102003
A
has joined
B
joins
C
had joined
D
joined
I’ve finally finished my paper and it ＿＿ me an entire month.
#104427
A
takes
B
took
C
was taken
D
had taken
Great changes ______ in the past few years, and a lot of factories ________.
#100648
A
had taken place; have been set up
B
have taken place; have been set up
C
took place; have set up
D
were taken place; were set up
---How bright the sun is! ---You’d better wear your dark glasses to_____ your eyes from it.
#99663
A
protect
B
prevent
C
keep
D
stop