(2016 ·浙江)Had the governments and scientists not worked together, AIDS-related deaths ________ since their highest in 2005.
A.had not fallen B.would not fall
C.did not fall D.would not have fallen
Bless your heart, I know you didn’t break the vase ________. Don’t cry！
A.on purpose B.by accident
C.on business D.by mistake
—Monitor?
—I’m not monitor of our class. I ________ with the teacher until the monitor is elected.
A.will just help B.am just to help
C.am just helping D.have just helped
The new buyer identified a dozen new sources for the material, ________ proved to be reliable.
A.most of them B.most of which C.most whom D.most of those
________ I say Clancy is a smart boy, he still needs to work hard to achieve his goal.
A.If B.When C.As D.While
How long do you think ________the computer company brings out a new product?
A.it will be before B.will it be until
C.will it be when D.it will be that
