Although the causes of cancer ____we do not yet have any practical way to prevent it.

Although the causes of cancer ____we do not yet have any practical way to prevent it.

#105341

are being uncovered

have been uncovering

are uncovering

have uncovered

推荐题目

--- Would you care for a cup of coffee? --- I ________ one. Thank you just the same.

#105330

had

have had

would have

will have

—Sorry, I didn't catch you.—Be quiet, please; the baby          ________.

#105309

was sleeping

is sleeping

slept

has slept

They say the snow will ________ until the end of next week.

#105335

keep

last

start

stay

I'll go to the library as soon as I finish what I ________.

#105315

was doing

am doing

have done

had been doing

let’s go out now. It _____ any more.

#105337

didn’t rain

doesn’t rain

won’t rain

isn’t raining

共46题