In the future people can read books only _____ computers, not _____ paper. [ ]
A. on; in
B. on; on
C. in; on
D. in; in
答案:B
In the future people can read books only _____ computers, not _____ paper. [ ]
A. on; in
B. on; on
C. in; on
D. in; in
答案:B