Sales of CDs have greatly increased since the early 1990s, when people_____to en
题型：不详难度：来源：
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 |
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答案
| B |
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。 |
举一反三
—_______you _______him around the museum yet?
—Yes.We had a great time there.| A．Have;shown | B．Do;show | C．Had;shown | D．Did;show |
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More patients ___________ in hospital this year than last year.| A．treated | B．have treated | C．had been treated | D．have been treated |
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They _______ on the program for almost one week before I joined them, and now we ________ it as no good results have come out so far.| A．had been working; are still working | B．had worked; were still working | | C．have been working; have worked | D．have worked; are still working |
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Cathy is taking notes of the grammatical rules in class at Sunshine School， where she English now. | A．studies | B．studied | C．is studying | D．was studying |
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The flowers were so lovely that they __________ in no time.| A．sold | B．had been sold | | C．were sold | D．would sell |
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