【2015·江苏】30.The real reason why prices ____ , and still are, too high is complex, and no short discussion can satisfactorily explain this problem.

A. were                B. will be

C. have been            D. had been

To my delight, I from hundreds of applicants to attend the opening ceremony.

A. was chosen              B. was being chosen

C. would choose             D. had chosen

Mary really hard on his book and thinks he’ll have finished it by Friday.

A. worked                B. has been working

C. had worked            D. has worked

More expressways in Sichuan soon to promote the local economy.

A. are being built         B. will be built

C. have been built          D. had been built

Jane can’t attend the meeting at 3 o’clock this afternoon because she ______ a class at that time.

A. will teach           B. would teach

C. has taught          D. will be teaching

In my hometown, there is always a harvest supper for the farmers after all the wheat____ cut.

A. will have been        B. will be

C. was                    D. has been

—Is Peter coming?

—No, he____ his mind after a phone call at the last minute.

A. changes               B. changed

C. was changing         D. had changed

—Did you have difficulty finding Ann'house?

—Not really.She___us clear directions and we were able to find it.easily?

A.was to give          B.had given

C.was giving            D.would give

in the last few years,China ___ great achievements in environmental protection.

A.has made               B.had made

C.was making           D.is making

When walking down the street, I came across David, when I _____ for years.

A. didn’t see            B. haven’t seen

C. hadn’t seen          D. wouldn’t see