31. It was such a difficult problem __________ none of us worked out.
A. that B. as C. which D. what
29. ________ different life today is from what was 60 years ago!
A. How the B. What a C. How D. What
31. It was such a difficult problem __________ none of us worked out.
A. that B. as C. which D. what
29. ________ different life today is from what was 60 years ago!
A. How the B. What a C. How D. What