Sales of VCDs have greatly increased since the late 1990s ,people began to
问题描述：
Sales of VCDs have greatly increased since the late 1990s ,people began to
Sales of VCDs have greatly increased since the late 1990s ,people began to enjoy the advantage of this technology.
A and B when C which D because
答
D beacuse VCDs的销量自1990年後代大复上升因为人们开始享受这种科技带来的好处