While every possible means __________ to prevent the river pollution, the river in my hometown has still not been restored to its past beauty.

While every possible means __________ to prevent the river pollution, the river in my hometown has still not been restored to its past beauty.

#100447

is tried

are tried

has been tried

have been tried

推荐题目

—I heard the peasants here        very poor in the past.—Yes,but there        great changes in the past few years.

#104537

have been;have been

have been;were

were;have been

were;were

I am tired. I ______ all day.

#104217

am working

have been working

worked

have been worked

My brother wants to work in the factory which _________ now.

#101300

is building

has been built

is being built

is to be built

— I will come to attend your lecture at 10:00 tomorrow. — I’m sorry, by then my lecture will have ended and I _____ in my office.

#99619

am working

will work

will be working

will have worked

 — Beijing is well worth visiting. I _____ there with my parents during the holidays.— I agree. I have been there twice.

#100318

went

have gone

have been

would go

共5993题