does this scarf belong to?- Let me see. Oh, it may be . A. Who; hers B. Who; her C

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

A. begin(答案→)B. beganC. have begunD. had begun解析：本题考时态和句子结构。句中when是关系副词，引导定语从句，修饰the early 1990s。从句的意思是：当时（指in the early 1990s）人们开始喜欢这一新科技带来的好处。讲的是过去发生的事，与现在无关，排除A、C。从句中有表示过去具体时间的状语（when相当于in the early 1990s），不能用过去完成时。

收益了

这个答案应该是对的

(答案→)A. Who; hers B. Who; her C. Whose; her D. Whose; hers解析：句意：-- 这个围巾属于谁的？--让我看看。哦，它可能是她的。问句中特殊疑问词做belong to的宾语，所以用who。答句中需要的是名词性物主代词，代替 her scarf。所以要用hers。故选A.