We must try our best to the river being polluted any more.
#101113
A
separate
B
keep
C
prevent
D
guard
推荐题目
----Do you know our hometown at all? ----No, this is the first time I _____ here.
#102422
A
was
B
have been
C
came
D
am coming
Jim ______ a late night film at home when, right in the middle a thrilling scene, the television went blank.
#100588
A
watched
B
had watched
C
was watching
D
would be watching
－Hi ,Tom, why not attend my birthday party held last week?－I am sorry, I had meant to, but I something unexpected.
#103336
A
have met
B
had met
C
meet
D
met
His letter was especially welcome as I ____ from him for long.
#104693
A
haven’t heard
B
would not heard
C
hadn’t heard
D
didn’t heard
Yesterday if the policeman _______earlier, the fight between the two boys would have been prevented.
#103625
A
would have arrived
B
had arrived
C
were to arrive
D
arrived