This type of study was formerly restricted to book-based learning and (3)________ course but now includes courses on TV, CD-ROM or the Internet, and self-access courses at language or compute
This type of study was formerly restricted to book-based learning and (3)________ course but now includes courses on TV, CD-ROM or the Internet, and self-access courses at language or computer centers.
A. corresponding
B. corresponded
C. correspondent
D. correspondence