Sales of CDs have greatly increased since the early 1990s, when people _______ to enjoy the advantages of this new technology.
A.begin | B.began |
C.have begun | D.had begun |
相关知识点
推荐套卷
Sales of CDs have greatly increased since the early 1990s, when people _______ to enjoy the advantages of this new technology.
A.begin | B.began |
C.have begun | D.had begun |