All that can be done （　）

A:have been done B:have done C:has been done D:has done

I could have done it for you if you______.

A:ask me to B:asked me to C:have asked me to D:had asked me to

--"Did you review your lessons last night"
--"No, but if I ______, I would have done better on today's test."

A:had reviewed my lessons B:will review my lessons C:have reviewed my lessons D:have done

--"Did you review your lessons last night"
--"No, but if I （）, I would have done better on today’s test."

A:had reviewed my lessons B:will review my lessons C:have reviewed my lessons D:have done

--"Did you review your lessons last night"--"No, but if I ______, I would have done better on today's test."

A:had reviewed my lessons B:will review my lessons C:have reviewed my lessons D:have done

All that can be done ______.

A:have been done B:has been done C:have done D:has done

All that can be done ______.

A:have been done B:have done C:has been done D:has done

You （　） all those calculations! We have a computer to do that sort of thing.

A:needn’t have done B:must not have done C:shouldn’t have done D:can not have done