Sales of CDs have greatly increased since the early 1990s, when people_____to en

题干

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

上一题下一题 0.65难度单项选择更新时间:2018-03-18 10:28:49

小学学科试题库

初中学科试题库

高中学科试题库